Figure 4-21B. Hydraulic Cooling Fan Motor
b.
Inspection and Repair.
(1)
Discard all seals and thoroughly clean all parts: check that all machined faces and threads are free from
burrs, scores and other damage. Replace any damaged screws, retaining ring, dowels.
(2)
Inspect the gears for scored or worn side faces or journals, damaged teeth, thread or keyway, and surface
cracks.
(3)
While servicing the drive and driven gears, particular attention should be paid to the following points.
(a)
Gear widths of drive and driven gears must be within 0.005 mm (0.0002") of each other to endure
satisfactory pump efficiency.
(b)
Journals must be within 0.013 mm (0.0005") of each other.
(c)
Replacement gears are supplied as matched sets.
c.
Assembly.
(1)
Place the front cover (4), machined surface down, on a clean flat surface. Apply a little grease to the oil
seal (13) and, with garter spring facing into pump, use a suitable tool to press seal into cover. Install
retaining ring (12).
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