Macnaught K7/KR Mini-Lube Manuel D'instruction page 2

TROUBLE SHOOTING GUIDE
K7 PUMP UNIT
TROUBLE
The pump rod cap rises slowly
when not in use. (No visible
leak)
The rod cap springs up and the
unit will not pump grease.
The rod cap stays down, but
the unit will not pump grease.
Grease leaks at the top of the
clamp nut (7).
Grease leaks from the bottom
of the strainer cover (11).
Grease leaks from under the
clamp nut (7).
KR GREASE GUN
TROUBLE CAUSE
Coupler leaks. a) Dirt under the outlet ball (23) seat a) Remove the extension tube (28), spring keeper screw (21), spring (22) and
Note: There is nothing wrong with
the coupler itself.
b) The valve stem (3) is holding the
outlet ball (23) off its seat.
Gun leaks at the back Glyd ring worn
end of the piston.
Gun fails to deliver a) Faulty piston.
grease on the high
b) Seals (25, 26) are worn.
pressure setting.
c) Valve stem (3) has become loose
from the piston (8).
Gun fails to deliver a) Dirt on the inlet valve seat (9)
grease on the high
volume setting.
b) Operating plunger control (10)
sticking in body (16).
Push rod in the control O'ring (15) damaged.
body leaks
The gun leaks at the Worn seals (18, 32)
swivel joint.
When on the high a) Springs (2 or 4) may have
volume the gun is too collapsed.
slow or hard to
b) Grade of grease is too heavy.
operate.
c) Too much compression on the
outlet spring (22).
KM228 Issue10 © 2017
CAUSE
A) Dirt trapped between the inlet ball (28) and
the piston (10)
B) The piston o'ring (27) is defective or worn.
A) Air lock caused by:
i) Dent in the container
ii) Damaged follower o'ring (23).
B) Grease container empty.
C) Footvalve assembly is faulty.
A) The grade of grease is too heavy
B) The strainer (13) is blocked
Gland o'ring (6) and backup washer (5) are
damaged.
O'ring (14) damaged.
a) Dirt under the clamp nut (7).
b) Damaged seal washer (8).
REMEDY
ball (23).
Clean the seat and replace the ball, spring and spring keeper screw (part way).
Prime the pump and screw in the spring keeper screw until the grease stops
leaking. Then screw in an extra 2 full turns. Reassemble extension tube (28).
Note: If the coupler still leaks, replace the complete outlet body assembly.
When refitting the outlet body (24) hold the handle (29) in the closed position.
Enable the back-up washer and o'ring to enter squarely onto the piston.
b) Replace the piston assembly.
Replace the piston assembly.
a) Replace the piston assembly.
b) Replace seals (25, 26) in the outlet body.
c) Replace piston assembly.
a) Remove control body (16), tap out the valve seat (9), o'ring (14), ball (13)
and spring (12). Clean parts and replace in the correct order.
b) Replace the control body assembly.
Remove the control body and replace worn or damaged parts.
Replace swivel seals.
a) Fit KR-1K overhaul kit.
b) Change to NLGI No 2 grease or lighter.
c) Reset the spring tension (Refer to A , a) in trouble shooting guide) or replace
the outlet body assembly.
REMEDY
A) Unscrew the clamp nut (7) and withdraw the assembly.
Clean the ball (28) and piston (10).
B) Replace the piston o'ring (27).
A)
i) Remove dent or tilt follower (22) under the dent
ii) Replace the o'ring (23) in the follower (22)
B) Change to a new grease container or refill the old
container
C) Replace with a new footvalve assembly
A) Use NLGI No2 grease or lighter
B) Unscrew the clamp nut (7) and withdraw the assembly.
Using a screwdriver, lever off the strainer cover (11).
Clean or replace strainer(13).
Unscrew clamp nut (7) and withdraw assembly. Remove
piston (10). Carefully push against the spring (2) with the
clamp nut (7) and carefully undo the nut (29).
Replace the o'ring (6) and back up washer (5). support the
piston (10) when driving the pin (9) home. Ensure that the
flat end of the spring (2) fits in the cap (1).
Unscrew the clamp nut (7) and withdraw the assembly.
Using a screwdriver, lever off the strainer cover (11).
Replace o'ring (14)
a) Undo and clean surfaces.
b) Replace seal washer (8).
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