HYDRAULICS
4252490-Rev A 6-29
6
IMPORTANT
Cutting units must be lowered to the ground.
13. Disconnect tee fitting (4) from port “A” (3) of the lift
valve (5). Cap tee fitting.
Figure 6-20
NOTE
The test hose to be used in step 14 must have a
minimum length of 1 ft (304 mm) to provide sufficient oil
volume to momentarily maintain pressure during testing.
14. Connect a 2000 psi (138 bar) pressure gauge (7) to
one end of a test hose. Connect the other end of the
test hose to port “A” of the lift valve.
15. Start engine.
NOTE
The pressure gauge will indicate the relief valve pressure
setting, 1250 ± 10% psi (86 ± 10% bar), when the
raise/lower switch is activated to the fully raised position
and the relief valve opens.
16. Activate the raise/lower switch to the fully raised
position just long enough to open the relief valve,
then release the raise/lower switch and stop the
engine.
Does the pressure reading immediately begin to
fall?
YES Check valve (6) is bypassing oil. Repair or
replace check valve, then proceed to
step 17.
NO The check valve is not faulty. Proceed to
step 17.
17. Disconnect and remove test equipment. Install all
hoses, fittings, and components as noted prior to
removal.
Steering Leakage Test
See Figure 6-21.
1. Operate hydraulic system until oil temperature is
120–150° F (49–65° C).
2. Turn steering wheel fully left against stop.
3. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
!
WARNING
Figure 6-21
4. Disconnect hose (2) from steering cylinder fitting (3).
Plug hose.
5. Place a suitable container under steering cylinder
fitting (3).
!
WARNING
6. With engine off, turn steering wheel fully left against
stop.
7. Check for oil leakage in the drain pan.
TN1275
7
The hydraulic system is under pressure, and the
oil will be hot.
• Always relieve pressure in the hydraulic
system before performing service.
• Failure to follow appropriate safety
precautions may result in death or serious
injury.
Do not turn steering wheel to the right.
Failure to follow appropriate safety precautions
may result in death or serious injury.
TN3700
2
1
3
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