Jacobsen HR 5111, Service And Repair Instructions

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HYDRAULICS
SECTION 8R. INSTRUMENT TEST
8R-20
Left Wing Motor Valve Test (See Figure 8R-19)
NOTE
A pump section 2 test must be performed before
proceeding with this test.
8. Reconnect outlet line to pump, Section 2.
9. Remove hydraulic line from the port C of the left
wing inside motor and install a tee to hose. Cap
motor port.
10. Connect IN port of tester to tee in hydraulic line.
11. Put the hose from the OUT port of tester into the
hydraulic tank.
12. Open tester load valve, start engine, advance throt-
tle to 2800 engine rpm.
13. Push left wing mower reel switch into CUT and
pull implement switch ON.
14. Read/record no load flow. It should be the same
as the pump test.
15. Slowly close tester load valve until 2500 psi is
obtained.
16. Continue to close load valve until flow drops off
and pressure no longer increases.
17. Read/record pressure at the point where flow drops
off. This is the relief valve setting for the motor
valve.
•
If relief valve opens between 2950–3050, relief
is okay, proceed with Step 18.
•
If relief opens sooner than 2950 or more than
3050, the relief is faulty. Readjust, see relief
valve adjustments, reel system, wing mowers,
adjustment, Figure 8R-6.
18. Slowly open tester load valve until 2500 psi is
obtained.
19. Read/record gpm flow. Subtract flow obtained in
PUMP test.
•
If flow drops 1/2 gpm or less, motor valve is
okay, proceed with Step 20.
•
If flow drop is 1/2–1 gpm, motor valve is marginal.
•
If flow drops more than 1 gpm, motor valve has
excessive internal leakage.
Left Wing Motor Tests
NOTE
A pump and left wing motor valve test must be
performed before proceeding with this test.
20. Reconnect hydraulic line and tee to rear port of
left wing motor.
21. Using a 2 x 6" (50.8 x 152.4 mm) wooden block,
block the blade of the inside motor.
22. Open tester load valve, start engine, advance throt-
tle to 2800 engine rpm.
23. Push left wing reel switch into CUT and pull im-
plement switch ON.
24. Slowly close tester load valve until 2500 psi is
obtained.
25. Read/record gpm flow. Subtract from flow obtained
in LEFT WING MOTOR VALVE test.
•
If flow drop is 1/2 gpm or less, left wing motor is
okay.
•
If flow drop is 1/2–1 gpm, left wing motor is mar-
ginal.
•
If flow drops more than 1 gpm, left wing motor
has excessive internal leakage.
26. Repeat Steps 21–25 blocking the blade of the out-
side motor.
!
CAUTION
DO NOT exceed 3100 psi for this test.