CLEANING AND INSPECTION - TM-10-3930-607-150183

HYDRAULIC

2. Cover bearings, 11 and 12, may remain in the

cover or body when these parts are separated.

3. Identify gears and bearings so that they may be

returned to their original positions if used in reassembly.

4. Press the seal out of the cover, using an arbor

press and dowel.

D. CLEANING AND INSPECTION

1. Clean all parts thoroughly in solvent.

Figure 5.

2. Check gears and shafts for nicks, burrs, cracks,

or chipping. Discard component if any of these are

7. The relief valve ball should be free of pits. The

present.

spring should not be distorted nor the seat grooved.

E. ASSEMBLY

3. Examine gear chamber of body for evidence of

contact between gears and body, especially the intake

cavity of the body. Although wear of more than 1/64 of

1. Replace rubber O-rings at time of overhaul.

an inch is abnormal, it is not critical if the bearings are

Press a new seal assembly into the cover with an arbor

not defective.

press. The seal must enter at right angles to the body

recess and must not damage the body. Apply thin film

of non-hardening cement to the seal bore, and remove

4. Inspect the body and bearing for irregularities of

excess cement after seal is installed. Lubricate all parts

the bore caused by bearing attempting to turn or sings of

during assembly.

working.

NOTE: Generously lubricate all parts during pump

5. Examine bearings and body for scratches and

assembly.

pitting. Use fine sandpaper on a surface plate to dress

out any slight imperfections of bearings. Do not attempt

2. Insert body bearings in match marked positions,

to remove deep scratches or gouges.

Figure 5

and oil grooves toward pressure side of the pump.

illustrates method of dressing the bearing. Check

bearing bores for concentricity or smearing. Place

bearings in their respective positions in the body and

3. Install drive and driven gear with match marks

check clearance between bearing flats. Under no

aligned.

circumstances should these clearances exceed

specifications.

4. Slide cover bearings onto gear journals in match

marked position. Replace pressure spring.

6. Check milled seal and gasket recesses of the

cover for any obstruction that would prevent normal

5. Insert seal ring in the body bore. Install back-up

seating. Make sure internal threads of front cover and

rings and O-rings in the mounting flange bore. Back-up

threads on capscrews are in good condition.

ring goes in first.

B-147