Relief Valve
Removal
A. Contamination may cause valves to stick or hang
up. Contamination can become lodged in small valve
orifices or seal areas causing malfunction.
1.
Park machine on a level surface, stop engine, en-
gage parking brake, and remove key from the ignition
switch.
B. If sealing surfaces appear pitted or damaged, the
hydraulic system may be over heating or there may
be water in the hydraulic system.
CAUTION
CAUTION
Rotate steering wheel and depress traction ped-
al in both forward and reverse to relieve hydrau-
lic system pressure and to avoid injury from
pressurized hydraulic oil.
Use eye protection such as goggles when using
compressed air.
2.
system pressure.
Operate all hydraulic controls to relieve hydraulic
4. Clean relief valve cartridge using clean mineral spir-
its to flush out any contamination. Submerge cartridge
in clean mineral spirits to flush out contamination. Par-
ticles as fine as talcum powder can affect the operation
of relief valve. Use compressed air for cleaning.
3.
Installing Hydraulic System Components at the begin-
ning of the Service and Repairs section of this chapter.
Read the General Precautions for Removing and
Reassembly
4.
Disconnect hose assembly from hydraulic fitting at
bottom of relief valve body. Allow hose to drain into a
suitable container.
1. Lubricate new o–ring and back–up ring with clean
hydraulic fluid. Install o–ring and back–up ring to the re-
lief valve cartridge.
5.
Unscrew relief valve body from hydraulic adapter in
side of piston pump.
2. Carefully thread relief valve cartridge into the relief
valve body. The valve should go in easily without bind-
ing. Torque cartridge to 190 in–lb (21.4 N–m).
6.
If needed, remove hydraulic fitting from bottom of re-
lief valve body.
3.
Connect hydraulic fittings and O–rings to the relief valve
body.
Lubricate new O–rings with clean hydraulic fluid.
Installation
1.
Lubricate new o–rings with clean hydraulic fluid.
2.
lief valve body.
If removed, install hydraulic fitting into bottom of re-
5
6
3
3.
piston pump.
Secure valve body to the hydraulic adapter in side of
2
190 in–lb
(21.5 N–m)
7
1
4.
relief valve body. Tighten hose connections.
Install hydraulic hose to hydraulic fitting at bottom of
8
9
10
4
Disassembly
1.
Unscrew relief valve cartridge from the relief valve
body. Remove o–ring and back–up ring.
2.
Inspect ports of the relief valve body for damaged
sealing surfaces or threads and contamination.
Figure 41
3.
surfaces and contamination.
Inspect relief valve cartridge for damaged sealing
1.
2.
3.
4.
5.
Pump assembly
O–ring
Hydraulic adapter
O–ring
Relief valve body
6.
7.
8.
9.
Relief cartridge
Seal kit
Hydraulic fitting
O–ring
10. Hydraulic hose
Multi Pro 5700–D
Page 4 – 45
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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