Page Number - 4
CENTRO-MATIC
®
PUMP,
MODELS 84050, 85243 & 85460
4.1A-68430-D01
Form 403125
of air cylinder then replace packing.
8. Remove packing assembly (31). If grease leakage is
evident from side of air cylinder, then replace packing
assembly.
9. Inspect needle (30) and valve seat (32). If foreign matter is
lodged and is keeping the needle from sealing in valve
seat, clean and inspect for damage. If seat appears
damaged by nicks, grooves or scouring it should be
replaced. Remove valve seat (32) from valve body (34) by
placing a ¾” open end wrench onto the flats and loosening
the seat. The use of an adjustable wrench over the open
end wrench may be necessary due to the accessibility of
the seat.
10. Replace the valve seat (32) if damaged. Also be sure to
remove and replace the gasket (33) below the seat.
11. Reassembly is the reverse of the above procedure.
Needle (30) and air cylinder (27) inside diameter should
be coated with oil or grease to assist in assembly.
12. Upon reassembly tighten valve seat (32) into body (34)
using 25 ft-lbs. Tighten air cylinder (27) onto valve body
(34) using 100 ft-lbs.
Follower (see Illustration Page 6)
If follower wiper appears to be damaged or does not wipe the
sides of the container effectively service may be necessary.
1. Disconnect air supply from pump.
2. Remove the eight bolts (40) which attach the cover to the
reservoir.
3. Lift the entire pump, vent valve and cover assembly out of
the reservoir.
4. Unscrew the low level indicator (62) from the follower plate
(71).
5. Now remove the entire follower assembly from the pump
tube. After removing the follower assembly from the pump
tube wipe off the excess grease which will allow clean
access to the eight bolts that must be removed.
6. Loosen and remove the eight nuts (70) on top of the
follower.
7. Remove the follower weight (71) and the wiper (69).
Replace the wiper with a new one.
8. Re-assemble in the reverse of the above procedure
making sure that the long bolts are staggered with
the small ones and that they extend below the follower per
the dimension shown.
Low level indicator (see Illustration Page 6)
If the indicator pin appears to drop prematurely or water is
noticeable on top of the follower then the indicator seal (61)
may be damaged.
1. Remove the eight bolts (40) which hold the cover on to the
reservoir.
2. Inspect the reservoir seal (42) for damage. If damage is
apparent then replace the seal.
3. Remove the entire pump, vent valve and follower assembly
from the reservoir.
4. Remove the retaining ring (59) from the indicator rod
assembly (62).
5. Hold the indicator plug (64) with a wrench while removing
the indicator nut (60).
6. Remove and replace the O-ring (61).
7. Re-assemble in the reverse of the above procedure. Torque
the indicator note (60 to 20 ft-lbs.
Safety Unloader Valve (see Illustration Page 5)
The Safety Unloader (11) is set to open at 3,750 to 4,250 PSI
lubricant pressure. If pressure Switch fails to operate and
shut off air supply to pump, the Safety Unloader will open at
approximately 4,000 PSI to relieve lubricant supply line
pressure.
Safety unloader valve is not serviceable and should be
replaced if malfunction is apparent. Upon re-assembly,
tighten to 10 ft-lbs.
Bare Pump Assembly (See Illustration Page 5)
Please refer to the service page included for the bare pump
assembly (35).
© Indicates Change
