Traction System Test - Jacobsen AR-3 Technical/Repair Manual

HYDROSTATIC POWER TRAIN
2
5
4. Connect test hose and pressure gauge (2) to test
port (1).
NOTE
Verify engine rpm is within specification (3150 rpm ± 50)
to ensure accurate hydraulic test results.
5. Start engine and run at full throttle (3150 rpm ± 50).
6. Record pressure reading.
Is charge pressure between 150–160 psi
(10–11 bar)?
YES Charge pressure relief valve is good.
Proceed to step 7.
NO Inspect charge pressure relief valve and
replace if needed (See "Traction Pump" on
page 5-22.) Or proceed to traction system
test (See "Traction System Test" on
page 5-10.)
7. Stop the engine, disconnect and remove test
equipment. Install all hoses and fittings as noted prior
to removal.
5-12
1
Figure 5-7
Figure 5-8
8. Check hydraulic oil level. Add oil as needed. (Refer to
"Safety, Operation, and Maintenance Manual" for
correct oil specifications.)

Traction System Test

See Figures 5-10 through 5-12.
The hydraulic system is under pressure, and the
oil will be hot.
• Always relieve pressure in the hydraulic
system before performing service.
TN1291
• Failure to follow appropriate safety
precautions may result in death or serious
injury.
Required Tools and Materials
• Flow Meter
• Test Hose 4000 psi (276 bar)
• Blocking Disks
• Flow Lock Tool
1. Park the mower safely. (See "Park Mower Safely" on
page 1-7.)
2. Raise seat platform.
TN1066
3. Bypass seat switch.
Prevent personal injury. Use properly rated lifting
devices. Always be sure load is balanced before
lifting.
Support the machine properly using jack stands.
!
WARNING
!
WARNING
4181384 First Edition