Textron JACOBSEN GP400, Техническое руководство по ремонту

Страница: 155 / 354

HYDROSTATIC POWER TRAIN
4252490-Rev A 5-37
5
8. Retest charge pressure.
Is charge pressure 150–210 psi (10–15 bar)?
YES Charge pressure relief valve is good.
Proceed to step 11.
NO For 3WD models, proceed to step 9. For
2WD models, inspect, repair, or replace
charge relief valve. See “Traction Pump and
Control” on page 5-50, then proceed to
step 10.
Figure 5-23
9. Insert blocking disk at port “DR” (6) of flushing valve
and retest charge pressure.
Is charge pressure 150–210 psi (10–15 bar)?
YES Inspect, repair, or replace flushing valve.
See “Flushing Valve” on page 5-55, then
proceed to step 11.
NO Inspect, repair, or replace charge relief
valve. See “Traction Pump and Control” on
page 5-50, then proceed to step 10.
10. Retest charge pressure.
Is charge pressure 150–210 psi (10–15 bar)?
YES Charge pump is good. Proceed to step 11.
NO Inspect, repair, or replace charge pump as
needed. (See “Traction Pump and Control”
on page 5-50.)
11. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
12. Install and connect all components as noted prior to
test.
13. Check hydraulic oil level. Add oil as needed. (Refer
to “Parts and Maintenance Manual” for correct oil
specifications.)
Traction System Test
See Figures 5-24 through 5-31.
IMPORTANT
• Performing this test will isolate the traction pump
and wheel motors from the rest of the hydrostatic
system.
• This test works together with the traction pump
tests, wheel motors tests, and flushing valve
check valve test to isolate a problem within the
hydrostatic power train.
!
WARNING
NOTE
Procedure is for 3WD models. Procedure for 2WD
models is the same except where noted.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Bypass seat switch.
TN3931
6
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)
• Flow Lock Tool
• Wheel Restraints