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Reelmaster 4000–D
Page 4 – 71
Hydraulic System
Inspection of Traction Pump
1. Inspect the charge pump relief valve seat inside the
charge pump adaptor. It should be smooth and free of
burrs or other defects.
2. Inspect the charge pump relief valve poppet (42) and
spring (43).
3. Inspect the gerotor pocket inside the charge pump
adaptor assembly (2). It should not be scored exces-
sively.
4. Inspect the bearing (47) inside the charge pump
adaptor assembly, if the needles are free of excessive
play and remain in the bearing cage there is no need to
replace the bearing.
5. Inspect the check valve assembly (8), make sure the
ball seat is in good condition and the ball is free to move.
6. Inspect the flat surfaces of the back plate (9), the fin-
ish on the gerotor side should show on galled surface.
The finish on the piston block side should be smooth and
free of grooves. The back plate should be replaced if it
shows any of the wear characteristics outlined above.
The cam stop should be tight in the back plate.
7. Inspect the piston block. The surface that contacts
the back plate should be smooth and free of grooves.
8. The pistons should move freely in the piston block
bore. If they are sticky in the bore, examine the bore for
scoring or contamination.
9. Examine the O.D. of the pistons for finish condition,
they should not show wear or deep scratches. The
shoes should be snug fit on the ball end of the pistons.
The flat surfaces of the shoes should be flat and smooth.
DO NOT LAP THE PISTON SHOES.
10. Examine the spider. It should be flat, no cracks and
no signs of wear in the pivot area.
11. Examine the pivot. It should be smooth and show no
signs of wear.
12. The camplate (14) should be inspected for the
condition of the finish of the polished shoe surface. It
should show no signs of scoring.
13. Inspect the drive shaft (31) for fretting in the bearing
and spline areas.
14. Inspect thrust bearing (30) and thrust race (29) for
wear.
15. Inspect the needle bearing (6) in the housing as-
sembly. If the needles are free of excessive play and re-
main in the bearing cage, there is no need to replace the
bearing.
Hydraulic
System