Jacobsen HR5111 Service And Repair Instructions page 169

TRACTION SYSTEM RELIEF
Forward (See Figure 8R-5)
1. Use a 0–5000 psi gauge with test adapter P/N
551433.
2. Plug gauge into test port AD located on the top left
of the 4 wheel drive valve.
3. Set the parking brake, start the engine, advance
throttle to 2800 engine rpm, and push on the ser-
vice brake.
NOTE
Be sure dump valve is in the FORWARD posi-
tion (see Figure 8R-5).
4. Slowly push on the forward traction pedal.
•
The engine should labor and 3500 psi should
be obtained, relief valve is okay.
•
If 3500 psi cannot be obtained, proceed with
REVERSE pressure test.
Reverse (See Figure 8R-5)
1. Use a 0–5000 psi gauge with test adapter P/N
551433.
2. Plug gauge into port BD located on the top of the
4 wheel drive valve.
3. Set the parking brake, start the engine, advance
throttle to 2800 engine rpm, and push on the ser-
vice brake.
NOTE
Be sure dump valve is in the FORWARD posi-
tion (see Figure 8R-5).
4. Slowly push on the reverse traction pedal.
•
The engine should labor and 3500 psi should
be obtained, relief valve is okay.
•
If the forward relief valve test failed and the re-
verse relief valve test was okay, replace spring
and/or relief spool on the left side of traction
pump (see Figure 8R-5, Forward).
•
If only the reverse relief valve test failed, re-
place spring and/or relief spool on the right side
of traction pump (see Figure 8R-5, Reverse).
•
If both forward and reverse relief valve tests fail,
perform an instrument test as described in this
section.
SECTION 8R. INSTRUMENT TEST
Figure 8R-5. Traction System Relief
8R-5
HYDRAULICS
8R