38
307–920
DISPLACEMENT PUMP REPAIR
13. Screw the displacement pump about 3/4 of the way
into the bearing housing (27). Hold the pin (20) up to
the pin hole in the connecting rod assembly (29) and
continue screwing in the pump until the pin slides
easily into the hole. Back of f the pump until the top
threads of the pump cylinder are flush with the face
of the bearing housing and the outlet nipple (46) is
straight back. Push the retaining spring (35) into the
groove all the way around the connecting rod. Tight-
en the locknut (38) very tight–about 75–85 ft-lb (102
– 115 N.m)–with a 2 in. open–end wrench and a light
hammer.
See Fig 31.
WARNING
Be sure the retaining spring (35) is firmly in the
groove of the connecting rod, all the way around, to
prevent it from working loose due to vibration.
See
Fig 31.
If the pin works loose, it or other parts could break
off due to the force of the pumping action. These
parts could be projected through the air and result
in serious bodily injury or pump damage or property
damage.
If the locknut (38) loosens during operation, the
threads of the bearing housing (27) will be dam-
aged. Be sure to tighten the locknut firmly.
CAUTION
14. Tighten the packing nut (221) just enough to stop
leakage, but no tighter. Fill the wet–cup/packing nut
1/3 full with Graco TSL.
Fig 31
29
20
35
27
38
TORQUE TO
75–85 ft–lb
(102–115 N.m)
FACE OF
BEARING
HOUSING
Summary of Contents for 231-081
Page 47: ...47 307 920...
