Textron JACOBSEN GP400, Technical/Repair Manual

Page: 159 / 354

HYDROSTATIC POWER TRAIN
4252490-Rev A 5-41
5
Traction Pump Tests
See Figures 5-32 through 5-37.
IMPORTANT
• Performing this test will isolate the traction pump
from the rest of the hydrostatic system.
• This test works together with the traction system
test, wheel motors tests, and flushing valve
check valve test to isolate a problem within the
hydrostatic power train.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Before performing this test, perform traction system
test, leaving rear of mower lifted and supported
(3WD models), and flow meter and front wheel
restraints connected as outlined. (See “Traction
System Test” on page 5-37.)
3. For 3WD models, proceed to step 8.
Figure 5-32: Traction Pump Fittings—2WD Models
4. Install blocking disk between tee fitting (1) and hose
(2).
5. Install blocking disk between tee fitting (4) and hose
(3).
Figure 5-33
6. Open flow meter valve (5) completely before starting
engine.
7. Proceed to step 10.
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
• Flow Meter
• -8 ORFS Test Hoses 4000 psi (276 bar)
• -8 ORFS Blocking Disks
• Flow Lock Tool
TN3920
4
1
2
3
TN1359
5