Cub Cadet 8404 - Manual (Page 261)

HYDRAULIC SYSTEM
9-27 D615-W03 May-2003
615W929A
615W928B
15.2 MAINTENANCE
Housing Bore (Depth of Scratch)
1. Check if scratch occurred by gear in the surface of
housing.
2. If scratched more than half of inside housing surface,
the replace pump assembly.
3. Measure housing I.D. of inside surface without
scratch and measure housing I.D. with scratch.
4. If the value obtained from both measurements ex-
ceeds the allowable limit, replace the hydraulic
pump.
(Ref.)
Use cylinder gauge to measure housing I.D.
15.3 RELIEF VALVE
A. DISASSEMBLY, ASSEMBLY
a . Relief Valve Disassembly
1. Disengage plug (1) and pull out spring (5) and pop-
pet (6).
2. Pull out valve seat (7).
(When reassembling)
Make sure the O-ring is not damaged.
IMPORTANT:
• After disassembling or assembling the relief valve,
always adjust the setting pressure of the relief valve.
1. Disengage joint bolt (9) and install the pressure
gauge.
2. Start the engine and set it to max. speed.
3. Until relief valve is operated, move position lever
and read gage.
4. If the pressure is out of reference, disengage the
plug of hydraulic block (7) and adjust the adjusting
shim.
[See figure]
(1) Plug (6) Poppet
(2) Adjusting Shim (7) Valve Seat
(3) Adjusting Shim (8) O-Ring
(4) Hydraulic Block Body (9) Joint Bolt
(5) Spring (10) Hydraulic Pipe
Depth of
Scratch
0.09 mm
0.0035 in.
Allowable
Limit
Relief
valve
setting
pressure 16.2 ~ 17.2 Mpa
165 ~ 176 kgf cm 2
2347 ~ 2489 psi
Reference
pressure
Tightening
torque 49.0 ~ 68.6 N·m
5.0 ~ 7.0 kgf·m
36.2 ~ 5.06 lbf·ft
Relief valve
(1) Gear Pump (3) Hydraulic pipe
(2) Suction Pipe (4) hydraulic pipe