TM 5-3805-280-24-2
Hydraulic System
1--Pump Housing
22--Pin (2 used)
41--Cylinder Head (Cover)
64--Pump Pressure Sensor
3--Rear Pump Drive Shaft
23--Spring (2 used)
42--Servo Piston (2 used)
(2 used)
4--Front Pump Drive Shaft
25--Cylinder Block (Rotor)
43--Pin (2 used)
64A--O-Ring (2 used)
6--Roller Bearing (2 used)
(2 used)
44--Set Screw (2 used)
67--Plug (Fitting) (2 used)
7--Ring (2 used)
27--Front Pump Valve
46--O-Ring (2 used)
67A--O-Ring (2 used)
8--Roller Bearing (2 used)
Plate
47--Stop (2 used)
69--Pump Regulator (2
9--Bearing Nut (2 used)
28--Rear Pump Valve Plate
50--O-Ring (2 used)
used)
10--Ring (Rear Pump Drive
29--Dowel Pin (4 used)
51--Cover (2 used)
72--Spring Pin (4 used)
Shaft Only)
31--Feedback Link (2
54--O-Ring (20 used)
73--O-Ring (4 used)
12--Oil Seal (2 used)
used)
55--Cap Screw (16 used)
74--O-Ring (2 used)
13--Snap Ring (2 used)
32--Lever (4 used)
56--Lock Washer (16 used)
80--Plug (Fitting) (2 used)
15--Special Fitting (2 used)
33--Dowel Pin (4 used)
57--Backup Ring
80A--O-Ring
16--O-Ring (2 used)
34--Dowel Pin (2 used)
58--Spring Pin (2 used)
82--Bracket
19--Piston (14 used)
35--Snap Ring (12 used)
59--O-Ring
83--Cap Screw
21--Center Shaft (2 used)
36--Dowel Pin (2 used)
60--Cap Screw (12 used)
84--Lock Washer
10. Remove servo pistons (42) only if replacement is
7. Remove pump pressure sensors (64).
necessary.
8. Remove pump regulators (69). (See Disassemble
Heat the set screw (44) to loosen the thread lock
and Assemble Hydraulic Pump Regulator in this
and sealer (medium strength). Remove set screw
group.)
using a 6 mm hex key wrench. Remove pin (43).
CAUTION: The approximate weight of
11. Remove snap rings (35) and pins (33) to
cylinder head is 30 kg (66 lb).
disconnect feedback linkage.
Cylinder Head--Specification
IMPORTANT: The front pump (27) and rear pump
(28) valve plates are not
Weight ......................................................... 30 kg (66 lb) approximate
interchangeable. Take notice of the
IMPORTANT: The front and rear pump valve plates
location and position of ports in
(27 and 28) may stick to cylinder
plate. The inlet port in valve plate is
head (41) when head is removed.
located towards the center and top
The valve plates are connected to
of pump housing.
the feedback linkage and must
remain on the cylinder blocks (25).
12. Remove the front pump (27) and rear pump (28)
The valve plates and end of cylinder
valve plates. Protect machined surfaces of plates
blocks are made with highly
from damage.
machined surfaces and can be
damaged.
13. Remove cylinder blocks (25).
9. Remove cap screws (60). Checking that valve
14. Remove the pistons (19) by tipping piston towards
plates (27 and 28) remain on the cylinder blocks,
center of shaft and lifting up.
carefully remove cylinder head (41).
33
3360
33
Continued on next page
TX,33,UU3783
1921SEP988/17
21-73
