TM 5-3805-281-24-2
Hydraulic System
1--Cap Screw (4 used)
14--Left Pilot Cap (Cover)
26--Plug
40--Spring
2--Reduced Leakage Pilot
15--Cap Screw (4 used)
27--O-Ring
41--Special Cap Screw (8
Valve (2 used)
16--Swing Spool
28--Boom I Cover
used)
33
3--O-Ring (6 used)
17--Arm I Spool
29--Arm II Cover
42--Spring Seat (4 used)
3360
4--Boom Manual Lower
18--Boom II Spool
30--O-Ring (10 used)
43--Stopper (2 used)
105
Valve
19--Auxiliary Spool
31--Right Control Valve
44--Spring (2 used)
5--O-Ring (3 used)
20--Left Propel Spool
Housing (4 Spool)
45--Spring (2 used)
6--Plug (6 used)
21--Left Control Valve
32--Bypass Shut-Off Spool
46--Special Cap Screw (2
7--Plug
Housing (5-Spool)
33--Arm II Spool
used)
8--Plug
22--Pilot Cap (Cover) (5
34--Boom I Spool
47--Spring (7 used)
9--O-Ring (6 used)
used)
35--Bucket Spool
48--Spring (7 used)
10--Right Pilot Cap (Cover)
23--Pilot Cap (Cover) (2
36--Right Propel Spool
49--Stopper (7 used)
11--O-Ring (11 used)
used)
37--Spring Seat
12--Cap Screw (32 used)
24--Plug
38--Stopper
13--Plug
25--O-Ring (8 used)
39--Spring
NOTE: It is not always necessary to remove the
are a different design for each
control valve to remove individual components.
function. Spools must be installed
into the same bores from which they
The letters A--E are used in the illustrations to
were removed for proper operation
indicate the location of parts in housings.
of machine.
Remove spools (16--20 and 32--36) from control
2. Reduced Leakage Pilot Valves and Boom
valves (21 and 31).
Manual Lower Valve: Remove cap screws (1).
Remove boom manual lower valve (4) and boom
For spools (20 and 36): Loosen special cap screw
reduced leakage pilot valve (2).
(46). Disassemble spring seat (42), springs (44 and
45) and stopper (43).
Remove cap screws (15). Remove arm rod end
reduced leakage pilot valve (2).
For spools (16--19 and 33--35): Loosen special
cap screw (41). Disassemble spring seat (37),
Install valves (2 and 4). Tighten cap screws.
springs (47 and 48) and stopper (49).
Arm Reduced Leakage Pilot Valve-to-Left Spring Cover Cap
Screw--Specification
For spool (32): Loosen special cap screw (41).
Disassemble spring seat (37), springs (39 and 40)
Torque......................................................................... 12 Nm (9 lb-ft)
and stopper (38).
Boom Reduced Leakage Pilot Valve and Boom Manual Lower
Remove pilot caps (cover) cap screws (12).
Valve-to-Right Spring Cover Cap Screw--Specification
Remove pilot caps (cover) (22 and 23), boom I
Torque......................................................................... 12 Nm (9 lb-ft)
cover (28) and arm II cover (29).
3. Valve Spools: Disassemble valve for cleaning and
Inspect all parts for wear or damage. Replace as
inspections only. Valve is serviced as an assembly.
necessary.
Remove cap screws (12). Remove left and right
upper pilot caps (10 and 14).
Install lower pilot cap screws. Tighten cap screws.
IMPORTANT: The spools (16--20 and 32--36) are
select fitted to bores in housing and
Continued on next page
CED,OUOE026,13 1919JUN988/21
19-137