Jacobsen HR5111 Service And Repair Instructions page 172

PRIORITY VALVE TEST
(See Figure 8R-8)
NOTE
A charge pump test must be performed before
proceeding with this test.
9. At the top of the traction pump, remove the outlet
line of the charge filter from the fitting.
10. Connect the IN port of the tester to the charge fil-
ter outlet line.
11. Completely open tester load valve.
12. Connect the OUT port of the tester to the tee.
13. Start the engine, slowly advance the throttle.
CAUTION
DO NOT close tester load valve.
Flow should increase to approximately 4.5–5.0
gpm at approximately 1900–2000 engine rpm. At
this point flow should stop increasing as engine
rpm continues to be installed.
•
If flow stops at 4.5–5.0 gpm as engine rpm con-
tinues to increase, priority valve is okay.
•
If flow does not increase to 4.5–5.0 gpm, priority
valve may be faulty. Continue with Lift System
Test, Step 15 for Front or Wing mowers.
•
If flow continues to increase above 4.5–5.0 gpm,
priority valve may be faulty. Continue with Lift
System Test, Step 15 for Front or Wing mowers.
SECTION 8R. INSTRUMENT TEST
8R-8
HYDRAULICS