PUMPS
SUBSECTION 5B
Figure 5B-1. Control Pump (37Z317)
2. Carefully lift back-up washers (05 and 06) and lobe seal
8. Remove the remaining pair of bushing assemblies and
(07) from bushing assembly (08 and 09).
place on the end cover. Make special note of how these
assemblies are installed to ensure proper assembly.
3. Lightly tap the mounting flange clear of the two hollow
dowels in the pump body and slide it squarely off the shaft,
INSPECTION AND REPAIR. After the pump is disassem-
Remove O-ring (04) from body (10).
bled, thoroughly clean all the parts and dry. Inspect for the
4. Repeat step 2 for the mounting flange end of the pump.
following defects:
5. Hold the pump body vertically with the mounting flange
1. Check for eroded parts. This indicates aeration or cav-
end down, support the bushings from underneath to pre-
itation
vent them from falling out.
2. Check for blackened parts or brittle O-rings and seals.
6. Tap the side of the body with a leather mallet to dislodge
This type of damage is caused by excessive heat.
the lower bushings and carefully slide these out of the body,
3. Check for excessive wear, sandblasting (dull finish), and
Keep bushings in a matched pair.
scoring. Abrasive wear is caused by fine particles (not
7. Invert the body and lift out the driver and driven gears (11
visible to the eye) or metal (coarse) particles in the oil. The
and 12).
system must be flushed and the filters replaced.
5B-3
