User's Manual

22 309024

Service

Determining Which Pin and/or Bearing is

Worn

1. Disassemble the VRHC. After the pins and bear-

ings are removed, wipe them off with a clean rag.

2. Visually inspect the pins for scoring, lines, grooves

and scratches on the area in contact with the

bearing. Then feel the surface of the pin for rough

areas or a difference in size. If these signs of wear

are detected, replace both the pin and bearing.

3. To check the bearings, hold the threaded part of

the bearing in one hand and use the other hand to

move the balls inside the bearing up and down. If

there is any noticeable movement, replace the

bearings. Also check the bearings for roundness. If

a bearing appears to be out of round (egg-

shaped), replace it.

Fitting the Pins into the Bearings

Tolerances between the surface of the pin and the

bearings are very close. Never force the pin into the

bearing. If the pin does not fit, sand it from the end to

just past the countersinks with 500 grit sandpaper. See

Fig. 12. If the pin still does not fit, return it to the

factory for replacement. If the pin needs replacement,

replace the bearing also.

02373

Fig. 12

Storage of Spare Pins and Bearings

Completely coat spare pins and bearings with Graco

Gear Reducer Oil (43) or the equivalent when storing

these parts. Never use grease.

Removing the Secondary Pump and/or the

Bearings and Pins

1. Flush the entire system with a compatible solvent.

WARNING

To reduce the risk of serious injury whenever you

are instructed to relieve pressure, always follow the

Pressure Relief Procedure on page 15.

2. Relieve the pressure.

3. Remove the safety panel (39). See Fig. 13.

Disconnect the inlet and outlet fluid hoses of the

secondary displacement pump (124).

Fig. 13

02366A

Continued on page 23.