Remove light score marks by lapping. Replace parts
badly scored or worn.
2. Mounting bracket
c. Check vanes for burrs, wear and excessive/ play
in slots. Replace rotor if slots are worn.
d. Check bearing for wear and replace if
e. Check oil seal mating surface on shaft for
7. Snap ring
scoring and wear. Replace shaft if score marks cannot
be removed with light polishing.
10. Control valve
f. Check that control valve moves freely in cover.
11. Pressure plate
Remove burrs from valve by polishing but do not round
off corners of lands. Do not rework valve bore. If bore is
damaged, replace cover.
a. Remove bolt (1) and mounting bracket
12-32. Reassembly and Installation Refer
to figure 12-6
b. Clamp the pump firmly but not tightly in vise with
and reassemble the pump as follows:
cover end up. Note and mark the position the cover (4)
a. Coat all parts with hydraulic fluid to facilitate
relative to the body (26). Remove screw (3) and cover
assembly and provide initial lubrication. Use petroleum
(4). Lift off O -ring (5).
jelly to hold O-rings in place during assembly.
c. Remove plug (6) and snap ring (7) only if
Install snap ring (7) and plug (6) if they were removed.
Be sure snap ring is seated in groove in cover.
d. Remove plug (8), spring (9) and control valve
c. Insert valve (10), small land first, in cover. Install
spring (9) and plug (8).
e. Remove pressure plate (11), spring (12) and
d. Press bearing (24) onto shaft (22) and then
press shaft and bearing into body (26). Install snap rings
f. Note and mark position of ring (14) relative to
120 and 23).
body (26). Lift off ring (14) and remove pin (15) Lift off O
e. Install seal (25) with spring toward cover end of
pump. Press seal in place and lubricate lip with
g. Take vanes (17) out of rotor (18) and take rotor
petroleum jelly or other lubricant compatible with the
h. Rotate pump body and remove key (19), snap
f. Install key (19) and nut (21)
ring (20), and nut (21). Tap with a soft hammer on the
g. Install 0 -rings (16 and 5). Insert pins (15) on
splined end of shaft (22) to drive shaft out body.
body and install ring (14). Check position as marked in
i. Remove snap ring (23). Support inner race of
step f. of disassembly.
bearing (24) and press shaft out of bearing.
h. Install rotor (18) on shaft and insert vanes (17) in
j. Use a small wire hook and remove seal (.25)
from body (26).
i. Install bushing (13) in pressure plate (11) Install
plate on locating pins and flat against ring.
Wash all metal parts with dry cleaning solvent (Federal
j. Place spring (12) in recess of pressure plate and
Specification P-S-661) and dry them with compressed
carefully install cover (4). Check cover-position as
marked in step b. of disassembly. Install screws (3) and
12-31. Inspection and Repair
a. Discard the seal and both O -rings.
b. Check wearing surfaces of body, press plate,
ring and rotor for scoring and excessive wear
Section VIII. REPAIR OF RADIATOR
as the crane radiator. Refer to chapter 3 for
The carrier is repaired in the same manner
radiator repair instructions