Jacobsen HR5111 Service And Repair Instructions page 168

LIFT SYSTEM RELIEF (See Figure 8R-4)
1. Use a 0–2000 psi gauge with test adapter P/N
551433.
2. Plug gauge into test port LD located on the con-
trol valve block.
3. Set the brake, start the engine and advance throt-
tle to 2800 engine rpm.
4. Raise cutting units and hold the control lever in
RAISE position.
•
If 1500 psi is obtained, relief valve is okay.
•
If 1500 psi cannot be obtained, proceed with re-
lief valve adjustment.
Adjustment (See Figure 8R-4)
1. Be sure engine is shut down.
2. Remove relief valve cap from lift valve.
3. Shims are used to adjust the pressure setting:
Adding shim(s) increases pressure.
Removing shim(s) decreases pressure.
NOTE
Always start with the smallest shim. Then increase
size as necessary.
Shims come in three thicknesses:
0.010" (0.25 mm)
0.015" (0.38 mm)
0.035" (0.89 mm)
4. Reinstall relief valve cap.
5. Repeat Steps 3 and 4 under Lift System Relief.
NOTE
If pressure does not change after making an ad-
justment, perform an instrument test described in
this section.
SECTION 8R. INSTRUMENT TEST
8R-4
HYDRAULICS