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Macnaught
USA
Our wide range of products includes hand and air operated grease
guns and pumps, hand and air operated oil pumps, oil and grease control
guns, oil and fuel meters, heavy-duty auto rewind hose reels, positive
displacement flowmeters, and an extensive range of accessories to suit
all these items.
1. There could be two causes:
a) There is dirt trapped between the inlet ball (11) and the piston (17). Unscrew
the clamp nut (8) and withdraw the assembly. Clean the inlet ball (11) and
piston (17) before reassembling.
b) The piston o’ring (12) is defective or worn and needs to be replaced.
Order KA43s, which includes the BS115 o’ring.
2. There could be three causes:
a) An air lock in the grease caused by
(i) a dent in the grease pail which stops the follower. Remove the dents or
tilt the follower (28) under the dent.
(ii) a damaged o’ring (27) in the follower (28) which needs to be replaced.
Order J17s, which includes the BS214 o’ring.
b) The grease pail is empty.
c) The footvalve assembly (31) is holding the ball (30) off the seat and needs
to be replaced. Order KM57s.
3. There could be two causes:
a) The grade of grease may be too heavy. Use only NLGI No.2 grade.
b) The strainer (20) is blocked. Unscrew the clamp nut (8) and withdraw assembly.
Using a screwdriver, lever off the strainer cover (18). Clean or replace the
strainer (20).
4. The gland o’ring is defective
or worn (7). Unscrew the clamp nut (8) and withdraw assembly. Unscrew
handle (1), hold down upper spring cover (35) against spring tension,
undo nut (3) and carefully remove cover (35), inner springs (33 & 34)
and lower cover (34). Withdraw piston rod (4) and replace o’ring
(7) and washers ((5 & 6). Order KA53s.
5. O’ring (19) is damaged.
Unscrew clamp nut (8) and withdraw assembly. Using a screwdriver, lever
off the strainer cover (18). Replace o’ring (19). Order KA45s,
which includes BS240 o’ring.
6. There could be two causes:
a) There is dirt under the clamp nut (8). Undo and clean surfaces.
b) The seal washer (9) is damaged and needs to be replaced. Order KA53s, which
includes KA55s seal washer.
1. There could be two causes:
a) There is dirt trapped between the inlet ball (26) and the piston (10). Unscrew
the clamp nut (7) and withdraw the assembly. Clean the inlet ball (26) and
piston (10) before reassembling.
b) The piston o’ring (25) is defective or worn and needs to be replaced.
Order KM23s, which includes BS115s o’ring.
2. There could be three causes:
a) An air lock in the grease caused by
(i) a dent in the grease pail which stops the follower. Remove the dents or
tilt the follower (20) under the dent.
(ii) a damaged o’ring (21) in the follower (20) which needs to be replaced.
Order KM81s, which includes BS214 o’ring.
b) The grease pail is empty.
c) The footvalve assembly (19) is holding the ball (18) off the seat and needs
to be replaced. Order KM57s.
3. There could be two causes:
a) The grade of grease may be too heavy. Use only NLGI No.2 grade
b) The strainer (13) is blocked. Unscrew the clamp nut (7) and withdraw assembly.
Using a screwdriver, lever off the strainer cover (11). Clean or replace the
strainer (13).
4. The gland o’ring (6) and
back up washer (5) are defective or
worn. Unscrew the clamp nut (7) and withdraw assembly. Hold piston 10) and
loosen nut (27). Remove pin (9) and withdraw piston (10). Ease spring tension
on nut (27) by pushing against spring (2) on clamp nut (7) and carefully undo
nut (27). Replace o’ring (6) and back up washer (5). Order N151s. When
reassembling, support piston (10) when driving pin (9) home and ensure the
flat end of the spring (2) fits in the cap (1).
5. There could be two causes:
a) The o’ring (14) is damaged. Unscrew clamp nut (7) and withdraw assembly.
Using a screwdriver, lever off the strainer cover (11). Replace o’ring
(14). Order KM76s, which includes the BS240 o’ring.
b) The spot welds are broken. Replace the lid base (15) by ordering KM76s.
6. There could be two causes:
a) There is dirt under the clamp nut (7). Undo and clean surfaces.
b) The seal washer (8) is damaged and needs to be replaced. Order N151s.
1. The link (5) is in the wrong
position on the handle and needs to be moved to the other hole.
2. There could be five reasons:
a) The o’ring (21) is damaged or missing from the follower and needs
to be replaced. Order BS218.
b) The pail is dented. Tilt the edge of the follower below the dent.
c) There is a hole in the pail. Transfer the grease to a new pail.
d) There a foreign body on the piston valve seat. Unscrew the pump tube and
clean the piston (10), and inspect the foot valve seat (15).
e) The piston o’ring (11) is damaged and needs to be replaced. Order
J53s (for Australia) or J54s (outside Australia), both of which contain the
BS212 o’ring.
1. There could be five causes:
a) An air lock caused by the follower getting stuck in the cartridge
(i) check the condition of the cartridge and replace if necessary,
(ii) lock the follower to the rod and push the follower into the cartridge.
b) An air lock caused by the grease being too thick or too cold
(i) consult your grease supplier,
(ii) store the grease gun and grease away from the extreme cold.
c) The check valve (10) ball seat is damaged or dirty. Remove the check valve
(10) and clean and inspect all components. Replace as required. It is important
to use Loctite (or similar) thread sealant on the check valve threads.
d) The body outlet (14) ball seat is dirty or damaged. Remove the ball (3)
and spring (4), and clean and inspect all components. Replace as required.
e) The piston o’ring is worn or damaged and needs to be replaced. Remove
the handle (20), pull out the plunger (13) and replace the o’ring (12).
Order KF122s, which includes the BS011 o’ring.
2. There could be two causes:
a) The follower (21) is damaged or perished and needs to be replaced. Order
K27-2K.
b) Over filling of the gun when using the filler pump. Stop pumping the filler
pump when the groove on the piston rod is visible at the back of the barrel.
1. There could be four causes:
a) An air lock caused by the follower getting stuck in the cartridge.
(i) check the condition of the cartridge and replace if necessary,
(ii) lock the follower to the rod and push it into the cartridge.
b) An air lock caused by the grease being too thick or cold.
(i) consult your grease supplier,
(ii) store the grease gun and grease away from extreme cold
c) The body outlet ball seat is dirt or damaged. Remove the ball (3) and spring
(4), and clean and inspect all components. Replace as required.
d) The piston o’ring (12) is worn or damaged. Remove the handle (13),
pull out the plunger (11) and replace the o’ring (12). Order KL18s, which
includes the BS011 o’ring.
2. There could be two causes:
a) The follower (17) is damaged or perished and needs to be replaced. Order
K27-2K
b) Over filling of the gun when using the filler pump. Stop pumping the filler
pump when the groove on the piston rod is visible at the back of the barrel.
1. There could be two causes:
a) There is air trapped in the pressure chamber. Disconnect the flexible hose
assembly (2) and apply pressure to the pull handle (25). Pull the trigger
until grease starts flowing (note: it may be necessary to remove the outlet
body (3) to release the air in the pressure chamber. When grease appears
at the gun outlet ensure that the ball (5) and spring (4) is in place before
replacing the outlet body).
b) There is dirt under the outlet ball, and both it and the seat need to be
cleaned.
2. There could be two causes:
a) The piston assembly (10) is faulty and needs to be replaced (check for escaping
air through the vent holes in the body (7)). Order KP85s.
b) The o’ring (16) is damaged and needs to be replaced (check for air
escaping from under the trigger). Order KP58s, which includes the BS006 o’ring.
1. There could be two causes:
a) The grease is too thick or too cold. Use NLGI No.2 grease and store in a
warm place.
b) The grease container is damaged causing the follower to stop. Repair or
replace the container. The follower must be able to move freely. 2. The air pressure is too low. Increase air pressure.
Minimum is 400kPa/60psi/4 bar, while maximum pressure is 850 kPa/125psi/8
bar. 3. There could be four causes:
a) There is grease leaking at the hose (19) and/or swivel (28 & 29) connections.
Check all connections. Use thread sealant and tighten leaking connections.
b) There is grease leaking at the B2 gun coupler (68). See Problem 5 below.
c) There is grease leaking at the seal condition hole. See Problem 4 below.
d) The high pressure seal (45) is worn or damaged and needs to be replaced
(order the PK88s) by performing the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the strainer tube (53). There are spanner flats on the bottom
of this tube,
(iv) remove the circlip (52), primer (51), valve seat (50) and valve spacer
(49),
(v) use a pipe wrench or vice grips to remove the tube link (48),
(vi) grip the HP suction tube (43), with a pipe wrench, as close as possible
to the top and remove it,
(vii) use the primer/piston rod assembly to push the washer (44), seal (45)
and cylinder (46) from inside the tube,
(viii) replace the worn parts and reassemble, ensuring all parts have correct
orientation, thread sealant has been applied, the strainer tube has been filled
with grease for initial prime, and the o’rings sit square and have had
light grease applied to them.
4. A small quantity of grease indicates
that seal lubrication is OK and no action is required. However, a continuous “worm” indicates
the piston rod seal (18) is worn or damaged and needs to be replaced
(order PA23s) by taking the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the 4 screws (22) holding the cylinder (7), to the base (21) and
pull off the valve body assembly and valve gasket (28),
(iv) hold the hex section of the insert (23) horizontally in a vice. Hold the
piston rod (13) as close as possible to the piston (11) with multi grips. Remove
the nut (8), piston (11), washers (9) and o’ring (12),
(v) remove the strainer tube (53). There are spanner flats on the bottom of
this tube,
(vi) remove the circlip (52), primer (51), valve seat (50) and valve spacer
(49),
(vii) use a pipe wrench or vice grips to remove the tube link (48),
(viii) grip the HP suction tube (43), with a pipe wrench, as close as possible
to the top and remove it,
(ix) pull out the primer/piston rod from the base (21) and use it to push the
washer (44), seal (45) and cylinder (46) out of the HP suction tube (43),
(x) remove the gland nut (17) and then the bottom (short) poppet valve assembly
(27), including the o’ring from the base (21),
(xi) use the primer/piston rod assembly to push the piston rod seal (18) from
the base (21),
(xii) replace the worn parts and reassemble, ensuring all parts have correct
orientation, thread sealant has been applied, the strainer tube has been filled
with grease for initial prime, and the o’rings sit square and have had
light grease applied to them.
5. There could be two causes:
a) Incorrect trigger adjustment. Take the following steps to adjust the trigger
to allow 3 – 6mm (?" - ¼") free movement:
(i) loosen locknut (82),
(ii) unscrew the adjusting screw (83) ¼ turn (or more if required),
(iii) check the trigger (85) free play,
(iv) tighten the locknut.
b) The plunger (60) is bent or damaged and needs to be replaced (order BJ1s,
which contains the BJ23 plunger) by taking the following steps:
(i) unscrew the valve body (63) from the gun body (69) (do not remove the extension
tube (67) from the valve body,
(ii) swing the trigger and valve body/extension tube assembly away to allow
access to the plunger guide bush (59),
(iii) unscrew the plunger guide bush (59),
(iv) remove the plunger (60) and seals (61 & 62),
(v) replace worn or damaged parts and reassemble. Use thread sealant on the
valve body (63) thread.
6. The air piston cup seals (10)
or air piston (11) is worn or damaged and needs to be replaced. Order
PA4s, which contains both the seals and piston. Remove the 4 screws
holding the cylinder (7) to the base (21) and lever the cylinder off
the base. Inspect the cup seals (10) and air piston (11) (check for
hairline cracks) and replace as required. Before reassembly, apply
light grease to the cup seals and o’rings (24 & 25).
7. There could be two causes:
a) The spool (34) is jammed in the valve body (30). Push the reset button (35),
and if the motor starts, disconnect the air line and apply 3 or 4 drops of
light oil to the air inlet of the pump. If the motor does not start, undertake
the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the cover screw (6) and valve body cover (31),
(iv) remove the 6 screws (33) holding the valve body (30) to the cylinder (7)
and pull of the valve body and valve gasket (28),
(v) pull out the 2 brass pins (32) from the valve body and lever out the valve
plugs (29 & 36),
(vi) gently push the spool (34) out of the valve body and be careful when removing
the o’rings (3 & 14)
(vii) replace the spool (34) and clean the valve body bore,
(viii) when reassembled apply 3 or 4 drops of light oil to the air inlet of
the pump.
b) The top poppet spring (4) is fatigued and needs to be replaced (order PA31s,
which includes the PA8 poppet)by taking the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the cover screw (6) and valve body cover (31),
(iv) remove the top (long) poppet valve assembly (2, 4 & 5) and o’rings
(3),
(v) replace the spring and reassemble, ensuring all parts have correct orientation,
thread sealant has been applied, the strainer tube has been filled with grease
for initial prime, and the o’rings sit square and have had light grease
applied to them.
8. The lower poppet spring (4) is
fatigued and needs to be replaced (order PA31s, which includes the
PA8 poppet) by taking the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the 4 screws (22) holding the cylinder (7) to the base (21) and
pull off the valve body assembly and valve gasket (28),
(iv) unscrew the lower poppet body (27),
(v) replace the poppet spring and reassemble, ensuring all parts have correct
orientation, thread sealant has been applied, the strainer tube has been filled
with grease for initial prime, and the o’rings sit square and have had
light grease applied to them.
1. There could be two causes:
a) The grease is too thick or too cold. Use NLGI No.2 grease and store in a
warm place.
b) The grease container is damaged causing the follower to stop. Repair or
replace the container. The follower must be able to move freely.
top 2. The air pressure is too low. Increase air pressure. Minimum
is 400kPa/60psi/4 bar, while maximum pressure is 850 kPa/125psi/8 bar.
top 3. There could be four causes:
a) There is grease leaking at the hose (19) and/or swivel (28 & 29) connections.
Check all connections. Use thread sealant and tighten leaking connections.
b) There is grease leaking at the B2 gun coupler (68). See Problem 5 below.
c) There is grease leaking at the seal condition hole. See Problem 4 below.
d) The high pressure seal (45) is worn or damaged and needs to be replaced
(order the PK88s) by performing the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the strainer tube (53). There are spanner flats on the bottom
of this tube,
(iv) remove the circlip (52), primer (51), valve seat (50) and valve spacer
(49),
(v) use a pipe wrench or vice grips to remove the tube link (48),
(vi) grip the HP suction tube (43), with a pipe wrench, as close as possible
to the top and remove it,
(vii) use the primer/piston rod assembly to push the washer (44), seal (45)
and cylinder (46) from inside the tube,
(viii) replace the worn parts and reassemble, ensuring all parts have correct
orientation, thread sealant has been applied, the strainer tube has been filled
with grease for initial prime, and the o’rings sit square and have had
light grease applied to them.
4. A small quantity of grease indicates
that seal lubrication is OK and no action is required. However, a continuous “worm” indicates
the piston rod seal (18) is worn or damaged and needs to be replaced
(order PA23s) by taking the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the 4 screws (22) holding the cylinder (7), to the base (21) and
pull off the valve body assembly and valve gasket (28),
(iv) hold the hex section of the insert (23) horizontally in a vice. Hold the
piston rod (13) as close as possible to the piston (11) with multi grips. Remove
the nut (8), piston (11), washers (9) and o’ring (12),
(v) remove the strainer tube (53). There are spanner flats on the bottom of
this tube,
(vi) remove the circlip (52), primer (51), valve seat (50) and valve spacer
(49),
(vii) use a pipe wrench or vice grips to remove the tube link (48),
(viii) grip the HP suction tube (43), with a pipe wrench, as close as possible
to the top and remove it,
(ix) pull out the primer/piston rod from the base (21) and use it to push the
washer (44), seal (45) and cylinder (46) out of the HP suction tube (43),
(x) remove the gland nut (17) and then the bottom (short) poppet valve assembly
(27), including the o’ring from the base (21),
(xi) use the primer/piston rod assembly to push the piston rod seal (18) from
the base (21),
(xii) replace the worn parts and reassemble, ensuring all parts have correct
orientation, thread sealant has been applied, the strainer tube has been filled
with grease for initial prime, and the o’rings sit square and have had
light grease applied to them.
5. There could be two causes:
a) Incorrect trigger adjustment. Take the following steps to adjust the trigger
to allow 3 – 6mm (?" - ¼") free movement:
(i) loosen locknut (82),
(ii) unscrew the adjusting screw (83) ¼ turn (or more if required),
(iii) check the trigger (85) free play,
(iv) tighten the locknut.
b) The plunger (60) is bent or damaged and needs to be replaced (order BJ1s,
which contains the BJ23 plunger) by taking the following steps:
(i) unscrew the valve body (63) from the gun body (69) (do not remove the extension
tube (67) from the valve body,
(ii) swing the trigger and valve body/extension tube assembly away to allow
access to the plunger guide bush (59),
(iii) unscrew the plunger guide bush (59),
(iv) remove the plunger (60) and seals (61 & 62),
(v) replace worn or damaged parts and reassemble. Use thread sealant on the
valve body (63) thread.
6. The air piston cup seals (10)
or air piston (11) is worn or damaged and needs to be replaced. Order
PA4s, which contains both the seals and piston. Remove the 4 screws
holding the cylinder (7) to the base (21) and lever the cylinder off
the base. Inspect the cup seals (10) and air piston (11) (check for
hairline cracks) and replace as required. Before reassembly, apply
light grease to the cup seals and o’rings (24 & 25).
7. There could be two causes:
a) The spool (34) is jammed in the valve body (30). Push the reset button (35),
and if the motor starts, disconnect the air line and apply 3 or 4 drops of
light oil to the air inlet of the pump. If the motor does not start, undertake
the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the cover screw (6) and valve body cover (31),
(iv) remove the 6 screws (33) holding the valve body (30) to the cylinder (7)
and pull of the valve body and valve gasket (28),
(v) pull out the 2 brass pins (32) from the valve body and lever out the valve
plugs (29 & 36),
(vi) gently push the spool (34) out of the valve body and be careful when removing
the o’rings (3 & 14)
(vii) replace the spool (34) and clean the valve body bore,
(viii) when reassembled apply 3 or 4 drops of light oil to the air inlet of
the pump.
b) The top poppet spring (4) is fatigued and needs to be replaced (order PA31s,
which includes the PA8 poppet)by taking the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the cover screw (6) and valve body cover (31),
(iv) remove the top (long) poppet valve assembly (2, 4 & 5) and o’rings
(3),
(v) replace the spring and reassemble, ensuring all parts have correct orientation,
thread sealant has been applied, the strainer tube has been filled with grease
for initial prime, and the o’rings sit square and have had light grease
applied to them.
8. The lower poppet spring (4) is
fatigued and needs to be replaced (order PA31s, which includes the
PA8 poppet) by taking the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the 4 screws (22) holding the cylinder (7) to the base (21) and
pull off the valve body assembly and valve gasket (28),
(iv) unscrew the lower poppet body (27),
(v) replace the poppet spring and reassemble, ensuring all parts have correct
orientation, thread sealant has been applied, the strainer tube has been filled
with grease for initial prime, and the o’rings sit square and have had
light grease applied to them.
1. There could be two causes:
a) The grease is too thick or too cold. Use NLGI No.2 grease and store in a
warm place.
b) The grease container is damaged causing the follower to stop. Repair or
replace the container. The follower must be able to move freely. 2. There could be two causes:
a) The air pressure is too low. Increase air pressure. Minimum is 400kPa/60psi/4
bar, while maximum pressure is 850 kPa/125psi/8 bar.
b) The air strainer (28) is partially blocked and needs to be cleaned. Remove
the air supply fitting followed by the o’ring (3) and strainer (28) from
the brass air inlet. Clean or replace the strainer, refit the strainer, o’ring
and air supply fitting, and use thread sealant tape on the male threads. BACK TO
TOP 3. There could be three causes:
a) There is grease leaking at the hose (19), pipework joints or B2 gun. Check
the entire system for leaks use thread sealant on all connections and tighten
leaking joints. Repair or replace the B2 gun if it is leaking.
b) There is grease leaking at the seal condition hole. See Problem 4 below.
c) The high pressure seal (46) is worn or damaged and needs to be replaced
(order the PK88s) by performing the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the strainer tube (54). There are spanner flats on the bottom
of this tube,
(iv) remove the circlip (53), primer (52), valve seat (51) and valve spacer
(50),
(v) use a pipe wrench or vice grips to remove the tube link (49),
(vi) grip the HP suction tube (44), with a pipe wrench, as close as possible
to the top and remove it,
(vii) use the primer/piston rod assembly to push the washer (45), seal (46)
and cylinder (47) from inside the tube (44),
(viii) replace the worn parts and reassemble, ensuring all parts have correct
orientation, thread sealant has been applied, the strainer tube has been filled
with grease for initial prime, and the o’rings sit square and have had
light grease applied to them. BACK TO
TOP
4. A small quantity of grease indicates
that seal lubrication is OK and no action is required. However, a continuous “worm” indicates
the piston rod seal (18) is worn or damaged and needs to be replaced
(order PA23s) by taking the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the 4 screws (22) holding the cylinder (7), to the base (21) and
lever the cylinder off the base (there is a slot in the base near the valve
body (31)),
(iv) hold the hex section of the insert (23) horizontally in a vice. Hold the
piston rod (13) as close as possible to the piston (11) with multi grips. Remove
the nut (8), piston (11), washers (9) and o’ring (12),
(v) remove the strainer tube (54). There are spanner flats on the bottom of
this tube,
(vi) remove the circlip (53), primer (52), valve seat (51) and valve spacer
(50),
(vii) use a pipe wrench or vice grips to remove the tube link (49),
(viii) grip the HP suction tube (44), with a pipe wrench, as close as possible
to the top and remove it,
(ix) pull out the primer/piston rod from the base (21) and use it to push the
washer (45), seal (46) and cylinder (47) out of the HP suction tube (44),
(x) remove the gland nut (17) and then the bottom (short) poppet valve assembly
(27), including the o’ring from the base (21),
(xi) use the primer/piston rod assembly to push the piston rod seal (18) from
the base (21),
(xii) replace the worn parts and reassemble, ensuring all parts have correct
orientation, thread sealant has been applied, the strainer tube has been filled
with grease for initial prime, and the o’rings sit square and have had
light grease applied to them. BACK TO
TOP
5. The poppet springs (4) are fatigued
and need to be replaced (order PA31s, which contains the PA8 poppet
spring) by taking the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the 4 screws (22) holding the cylinder (7), to the base (21) and
lever the cylinder off the base (there is a slot in the base near the valve
body (31)),
(iv) remove the top (long poppet valve assembly (2, 4 & 5) and o’rings
(3),
(v) remove the bottom (short) poppet valve assembly (27),
(vi) replace both poppet springs (8),
(vii) inspect the poppet piston assemblies (5 & 32) and replace as required,
(viii) replace the worn parts and reassemble, ensuring all parts have correct
orientation, thread sealant has been applied, the strainer tube has been filled
with grease for initial prime, and the o’rings sit square and have had
light grease applied to them. BACK TO
TOP
6. There could be two causes:
a) Incorrect trigger adjustment. Take the following steps to adjust the trigger
to allow 3 – 6mm (?" - ¼") free movement:
(i) loosen locknut (82),
(ii) unscrew the adjusting screw (83) ¼ turn (or more if required),
(iii) check the trigger (85) free play,
(iv) tighten the locknut.
b) The plunger (60) is bent or damaged and needs to be replaced (order BJ1s,
which contains the BJ23 plunger) by taking the following steps:
(i) unscrew the valve body (63) from the gun body (69) (do not remove the extension
tube (67) from the valve body,
(ii) swing the trigger and valve body/extension tube assembly away to allow
access to the plunger guide bush (59),
(iii) unscrew the plunger guide bush (59),
(iv) remove the plunger (60) and seals (61 & 62),
(v) replace worn or damaged parts and reassemble. Use thread sealant on the
valve body (63) thread.
7. The air piston cup seals (10)
or air piston (11) is worn or damaged and needs to be replaced. Order
PA4s, which contains both the seals and piston. Remove the 4 screws
holding the cylinder (7) to the base (21) and lever the cylinder off
the base. Inspect the cup seals (10) and air piston (11) (check for
hairline cracks) and replace as required. Before reassembly, apply
light grease to the cup seals and o’rings (24 & 25). BACK
TO TOP
8. There could be two causes:
a) The spool (34) is jammed in the valve body (30). Push the reset button (35),
and if the motor starts, disconnect the air line and apply 3 or 4 drops of
light oil to the air inlet of the pump. If the motor does not start, undertake
the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the cover screw (6) and valve body cover (32),
(iv) remove the 6 screws (34) holding the valve body (31) to the cylinder (7)
and pull of the valve body and valve gasket (29),
(v) pull out the 2 brass pins (33) from the valve body and lever out the valve
plugs (30 & 37),
(vi) gently push the spool (35) out of the valve body and be careful when removing
the o’rings (3 & 14)
(vii) replace the spool (35) and clean the valve body bore,
(viii) when reassembled apply 3 or 4 drops of light oil to the air inlet of
the pump.
b) The top poppet spring (4) is fatigued and needs to be replaced (order PA31s,
which includes the PA8 poppet)by taking the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the cover screw (6) and valve body cover (32),
(iv) remove the top (long) poppet valve assembly (2, 4 & 5) and o’rings
(3),
(v) replace the spring and reassemble, ensuring all parts have correct orientation,
thread sealant has been applied, the strainer tube has been filled with grease
for initial prime, and the o’rings sit square and have had light grease
applied to them. BACK TO
TOP
9. The lower poppet spring (4) is
fatigued and needs to be replaced (order PA31s, which includes the
PA8 poppet) by taking the following steps:
(i) disconnect the air supply and release grease pressure by squeezing the
B2 gun trigger,
(ii) remove the HP grease hose and lid from the pump unit,
(iii) remove the 4 screws (22) holding the cylinder (7) to the base (21) and
lever the cylinder off the base (there is a slot in the base near the valve
body (31)),
(iv) unscrew the lower poppet body (27),
(v) replace the poppet spring and reassemble, ensuring all parts have correct
orientation, thread sealant has been applied, the strainer tube has been filled
with grease for initial prime, and the o’rings sit square and have had
light grease applied to them.
1. The plunger adjusting screw
(18) has been screwed in too far. Loosen the locknut (17) and screw
the plunger adjusting screw (18) out until a uniform flow of grease
occurs. 2. There could be three causes:
(a) There is dirt under the valve seat in the inlet body (14). Unscrew the
inlet body (14) from the gun body (11) and then unscrew the valve insert (8).
Remove the valve spring (7) and steel ball (6) before cleaning the ball seat
and reassembling.
(b) The plunger screw (18) has been incorrectly adjusted. Loosen the locknut
(17) and screw the plunger adjusting screw (18) in until maximum trigger movement
is achieved. Do not screw it in too far (refer to problem 1 above).
(c) There is dirt under the non return valve (5) ball seat. Unscrew the extension
tube (9) from the non return valve body (5). Remove part nos. 8, 7, 6 & 5,
before cleaning all parts and reassembling. BACK TO
TOP 3. There could be two causes:
(a) The trigger (22) has been set incorrectly. Refer to problems 1 and 2(b)
above.
(b) There is dirt under the ball (12). Unscrew the inlet body (14) from the
gun body (11). Unscrew the inlet body (14) from the gun body (11), and then
unscrew the extension tube (9) and swing the trigger (22) away so the plunger
guide bush (1), plunger (2), glyd ring (3) and plunger o’ring (4) may
all be removed. This will enable the ball (12), ball support (16), ball spring
(13) and spring guide (15) to be pushed from the gun body (11). Inspect and
clean all parts, replace as required and reassemble. Apply Teflon tape (or
thread sealant) to the extension tube (9) thread for sealing the tube to the
non return body (5). 4. The plunger o’ring (4) is damaged and needs to be
replaced. Order BJ1s. Remove the extension tube (9) and swing the trigger (22)
away so the plunger guide bush (1), plunger (2), glyd ring (3) and plunger
o’ring (4) may all be removed. Replace damaged parts and reassemble.
Apply Teflon tape (or thread sealant) to the extension tube (9) thread for
sealing the tube to the non return body (5). BACK TO
TOP 5. The swivel seals (25 & 26) are damaged and the entire
swivel needs to be replaced. Order ZSB. 6. The threads are not sealed. Disassemble and apply Teflon
tape (or thread sealant) to the male thread (2-3 layers should suffice). BACK TO
TOP
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