TM 5-3805-280-24-1
Hydraulic System
1A--Brake Valve Housing
15--Spring (2 used)
25--Plug
31--Plug
1B--Check Valve Poppet
17--Plug (2 used)
25A--O-Ring
32--O-Ring
1C--Counterbalance Valve
17A--O-Ring (2 used)
29--Servo Piston Shuttle
33--Plug (2 used)
07--Spring (2 used)
21--Crossover Relief Valve
and Brake Release
33A--O-Ring (2 used)
08--Spring (2 used)
(2 used)
Shuttle Ball (2 used)
35--Plug (5 used)
09--Stop (2 used)
23--Pressure Reducing
30--Servo Piston Shuttle
35A--O-Ring (5 used)
02
11--Plug (2 used)
Valve Spool
and Brake Release
0260
12--O-Ring (2 used)
24--Spring
Shuttle Seat (2 used)
27
Check Valve Plug--Specification
NOTE: Valves can be removed with propel motor on
the machine.
Torque................................................................... 235 Nm (173 lb-ft)
Apply a film of clean hydraulic oil to parts before
BRAKE PRESSURE REDUCING VALVE
assembly.
1. Remove brake pressure reducing valves (23--25).
CROSSOVER RELIEF VALVE
2. Tighten plug (25).
1. Remove crossover relief valves (21).
Brake Pressure Reducing Valve Plug--Specification
2. Check and adjust pressure setting. (See Propel
Motor Crossover Relief Valve Test and Adjustment
Torque....................................................................... 69 Nm (51 lb-ft)
in Group 9025-25.)
BRAKE RELEASE SHUTTLE VALVE
3. Tighten crossover relief valve plug.
1. Remove brake release shuttle valves (29--32).
Crossover Relief Valve Plug--Specification
2. Remove seat (30) using a 5 mm hex key wrench.
Torque................................................................... 540 Nm (400 lb-ft)
3. Seat may need to be heated to break down thread
COUNTERBALANCE VALVE
lock and sealer. This can be done by inserting a
steel rod into the hole and heating the rod to
1. Remove counterbalance valves (1C, 7--9, 11, and
transfer the heat to the seat.
12).
IMPORTANT: Oil will leak past ball if it is not
2. Tighten plug (11).
seated properly.
Counterbalance Valve Plug--Specification
4. Install ball (29).
Torque................................................................... 215 Nm (160 lb-ft)
5. Place ball on seat and tap ball with a hammer to
obtain a tight fit between ball and seat. After
CHECK VALVES
installing ball insert a metal bar into the plug hole
so it rests on the ball. Tap other end of bar with a
1. Remove check valves (1B, 15, and 17).
hammer to obtain a tight fit between ball and
housing.
2. Tighten plug (1B).
Continued on next page
TX,02,UU3724
1918SEP982/3
12-50