TM 5-3810-294-34
KEY to fig. 12-6
14.
Ring
Remove light score marks by lapping. Replace parts
1. Bolt
15.
Pin
badly scored or worn.
2. Mounting bracket
16.
O ring
c. Check vanes for burrs, wear and excessive/ play
3. Screw
17.
Vane
in slots. Replace rotor if slots are worn.
4. Cover
18.
Rotor
d. Check bearing for wear and replace if
5. O-ring
19.
Key
necessary.
6. Plug
20.
Snap ring
e. Check oil seal mating surface on shaft for
7. Snap ring
21.
Nut
scoring and wear. Replace shaft if score marks cannot
8. Plug
22.
Shaft
be removed with light polishing.
9. Spring
23.
Snap ring
10. Control valve
24.
Bearing
f. Check that control valve moves freely in cover.
11. Pressure plate
25.
Seal
Remove burrs from valve by polishing but do not round
12. Spring
26.
Body
off corners of lands. Do not rework valve bore. If bore is
13. Bushing
damaged, replace cover.
a. Remove bolt (1) and mounting bracket
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.
b.
c. Remove plug (6) and snap ring (7) only if
Install snap ring (7) and plug (6) if they were removed.
necessary.
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
(10).
spring (9) and plug (8).
e. Remove pressure plate (11), spring (12) and
d. Press bearing (24) onto shaft (22) and then
bushing (13).
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
-ring (16).
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
off shaft.
system fluid.
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)
rotor.
from body (26).
i. Install bushing (13) in pressure plate (11) Install
12-30. Cleaning
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
air.
marked in step b. of disassembly. Install screws (3) and
12-31. Inspection and Repair
them
to
80'5
foot-pounds.
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
12.33. General
as the crane radiator. Refer to chapter 3 for
The carrier is repaired in the same manner
radiator repair instructions
12-14
