User's Manual

24 309024
Service
Replacing the Secondary Pump and/or the
Bearings and Pins
NOTE: Refer to Fig. 14 for Steps 1 to 3.
1. If only the secondary pump is being replaced:
a. Screw the secondary pump (124) into the inlet
manifold (32). The manifold must face the end
of the VRHC as shown in Fig. 14. If it does
not, rotate the secondary displacement pump
until it does, and tighten the locknut (3) against
the inlet manifold. Torque the locknut to 60 ft-lb
(81 N.m).
b. Replace the connecting rod assembly (117,
14a, 34a, 31a) onto the displacement rod, and
line up the cotter pin holes. Insert the cotter
pin (102).
c. Raise the lever arm (49) and place the
support (31a) under the proper slot.
d. Push down the lever arm until the support fits
into the slot. If the support does not line up
with the slot, rotate it clockwise until it does.
e. Place the ratio index clamp (30) over the top of
the support (31a). Insert the capscrews (16a).
f. Set the index clamp (30) for the proper ratio
and tighten the capscrews (16a).
2. If replacing the lower bearing (14b) and support
pin (34b):
a. Place a generous amount of Graco Gear
Reducer Oil (43) on the inside of the lower
bearing (14b) and the surface of the support
pin (34b).
b. Screw the locknut (3) onto the bearing (14b)
threads until the locknut bottoms out.
c. Slide the bearing into the slot in the
support (31b). Insert the pin (34b) into place
with the countersinks under the setscrew (17)
holes. Tighten the setscrews to 35 in-lb (4
N.m). These are 10–32 self-locking setscrews.
If no drag is felt while turning, replace the
setscrew.
d. Screw the secondary displacement
pump (124) and manifold (32) onto the
bearing (14b) until it bottoms out. Be sure it is
not resting against the locknut (3).
e. Align and loosely install the two clamps (28)
and capscrews (16b).
3. If replacing the upper bearing (14a) and support
pin (34a):
a. Place a generous amount of Graco Gear
Reducer Oil (43) on the inside of the upper
bearing (14a) and the surface of the support
pin (34a).
b. Slide the support (31a) onto the bearing (14a).
Insert the support pin (34a) with the counter-
sinks in place under the setscrew (17a) holes.
CAUTION
Do not force the pin into place. Check for burrs on
the pin or in the VRHC frame if the pin does not slide
into place.
c. Tighten the setscrews (17a) to 35 in-lb
(4 N.m). These are 10–32 self-locking screws.
If no drag is felt while turning, replace the
setscrews.
d. Place the support (31a) in a vise and screw
the connecting rod (117) onto the bearing
(14a). The connecting rod and the bearing can
be disassembled and then reused one time
before needing replacement. Be sure to seal
the connecting rod and the bearing with thread
sealant such as Loctite No. 27105 or the
equivalent. Apply 3 drops of the sealant to the
threads of the bearing.
e. Screw the connecting rod (117) onto the
pump (124) until the cotter pin holes line up (if
the displacement pump has them). Install the
cotter pin (102) and tighten the connecting rod
against the piston shoulder of the displace-
ment rod.
f. Follow steps 1.c to 1.f at left.
g. Tighten the capscrews (16b) at the bottom of
the secondary displacement pump (124).