TM 5-3740-218-13&P
HYDRAULIC MOTOR REPAIR (CONT)
C.
INSPECTION
(1)
Inspect wear plate and thrust plate for scoring or uneven wear. If scored or worn, replace motor (para 4-44).
(2)
Inspect needle bearings in body and cover. If bearings are skewed, broken, or otherwise damged, replace
a
motor (para 4-44).
(3)
Inspect gear journals and faces for wear or scoring. If gear journal wear exceeds 0.001 in. (0.00254 cm),
replace motor (para 4-44).
(4)
Inspect body for wear or scoring. If gear contact wear on low-pressure (outlet) side exceeds 0.005 in.
(0.0127 cm) depth, replace motor (para 4-44).
D.
REPAIR
(1)
Using emery stone file (item 7, Appendix E), remove burrs or sharp edges from shaft end, keyway, and
body.
(2)
Other repair is limited to removal and replacement of parts in parts repair kit.
E.
ASSEMBLY
CAUTION
Install shaft seal square with face of bore. Do not allow shaft seal to cock during
installation or leakage and premature motor failure will result.
NOTE
All parts of parts repair kit should be used to replace parts in pump motor.
(1)
Place cover (1), shaft seal (2) bore up, on flat plate in arbor press.
(2)
Press shaft seal (2) below front face of cover (1) 0.155-0.165 in. (0.394-0.419 cm). Pack area between
double lip of shaft seal (2) with Lubriplate (item 35, Appendix E) or equivalent.
(3)
Install retainer (3), sharp edge out.
(4)
Invert cover (1) so gear bores are up. Install ball bearing (4). Install new pressure loading seal (5) in seal
grooves against bottom of bore surface. Install wear plate (6) in bottom of bore, making sure pressure
loading seal (5) is positioned properly in seal grooves and is against bottom of bore surface.
(5)
Lubricate bearings in cover and face of wear plate (6) with SAE 10W-40 oil (item 40, Appendix E).
(6)
Apply Lubriplate (item 35, Appendix E) or equivalent to outer surface of drive shaft installation sleeve.
5-44
