Service Manual

TX 413 Service Manual
9-7
TESTING
Rev. 000
11. If flow does meet specification, look for restriction
of a hydraulic line from outlet of loader valve
to couplers. If no restrictions are found then
repair or replace auxiliary valve and/or couplers.
Repeat.
12. Replace o-rings and reinstall hydraulic line from
loader valve to auxiliary valve and tighten.
13. Check hydraulic fluid and add as needed.
14. Start unit and check for leaks.
15. Remove drain pans.
16. Release park brake.
17. Shut engine off.
Figure 543 DSC-1516
This test checks pressure output after the loader
valve. Test gauge is connected the same as test 4.
Pressure will be determined with the fl ow restrictor
open on the fl ow gauge and taking a reading on the
pressure gauge. The pressure can be adjusted at the
relief on the loader valve. If the pressure does not
change by turning the relief screw and test 1 has been
performed, then the relief valve or the loader valve
needs to be repaired or replaced. If the pressure tests
to specifi cation, the loader valve is not the problem.
The auxiliary valve, hoses, steel line, or couplers
could be at fault.
Test 5 - Pressure Test Loader Valve to
Auxiliary Valve
1. Warm hydraulic fluid to operating temperature.
2. Set park brake.
3. Shut engine off.
4. Use 2 drain pans. Place one under loader valve
and one under auxiliary valve.
5. Disconnect hydraulic line from loader valve to the
auxiliary valve.
6. Connect pressure/flow gauge from loader valve
to the auxiliary valve.
7. Start engine and run at full recommended RPM.
8. Take pressure gauge reading.
9. If pressure does not meet specification check for
any hydraulic line restrictions and relief valve on
loader valve. Then repair or replace loader valve.
10. If pressure does meet specification check for
restriction of a hydraulic line from outlet of loader
valve to couplers. If no restrictions are found then
repair or replace auxiliary valve and/or couplers.
Repeat.
11. Replace o-rings and reinstall hydraulic line from
loader valve to auxiliary valve and tighten.
12. Check hydraulic fluid and add as needed.
13. Start unit and check for leaks.
14. Remove drain pans.
15. Release park brake.
16. Shut engine off.
Figure 544 DSC-1516
Test 5 - Pressure Test from the Loader
Valve to Auxiliary Valve