Jacobsen AR3, Техническое руководство по ремонту

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HYDRAULICS
4181384 First Edition 6-39
6
31. Calculate center rear cutting unit motor leakage.
(Step 20 – Step 29 / Step 20 x 100 = Leak
Percentage)
Is center rear cutting unit motor leakage 10% or
less?
YES The center rear cutting unit motor is good.
Proceed to step 32.
NO Proceed to next question.
Is center rear cutting unit motor leakage 11% to
20%?
YES The center rear cutting unit motor is
marginal. Replace as needed.
NO Proceed to next question.
Is center rear cutting unit motor leakage 21% or
more?
YES Replace center rear cutting unit motor. (See
“Cutting Unit Motor” on page 6-46.)
32. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
33. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Lift/Steer System Relief Valve
Pressure Test
See Figures 6-32 and 6-33.
!
WARNING
1. Operate hydraulic system until oil temperature is at
120—150°F (49—65°C).
2. Park the mower safely. (See “Park Mower Safely” on
page 1-7.)
3. Raise seat platform.
Figure 6-32
Figure 6-33
4. Connect test hose from test port (1) to pressure
gauge (2).
5. Lower seat platform.
!
CAUTION
6. Start engine and run at full throttle (3150 rpm ± 50).
7. Turn steering wheel fully right against stop.
8. Record pressure reading.
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.
Required Tools and Materials
• Pressure Gauge 5000 psi (345 bar)
• Test Hose 5000 psi (345 bar)
Do not run mower lift/steer system relief valve
over relief longer then 10 seconds or damage
may occur to hydraulic system.
TN1124
1
TN1066
2