JLG 1100S Service Manual - Manual (Page 270)

SECTION 5 - HYDRAULICS
5-48 – JLG Lift – 3121256
Pump Control Disassembly For Cleaning
NOTE: If the Function Pump does not perform correctly
after following the pre-start start-up procedures, it is possi-
ble that a contaminate particle has lodged in the pump
control preventing proper operation. The pump control’s
internal parts are not provided as spare parts due to the
close tolerances required between the mating parts. How-
ever, the control can be disassembled, cleaned and
placed back in service should the only problem prove to
be contamination. Disassembly, inspection, cleaning and
reassembly MUST BE done in a clean well-illuminated
area.
Pump Control removal:
1. Disconnect plug the hose attached to the pump
control Port ”X”.
2. Remove the four (4) socket head cap screws that
attach the control to the pump. Insure that the three
(3) ”0”-rings are also removed with the control.
3. Hydraulic fluid may drip from the pump. Wiping the
surface clean and installing some adhesive tape
should prevent oil from seeping from the pump con-
trol.
4. Work on a clean, lint free area.
NOTE: The pump control can be equipped with either O-
rings or a sealing plate. These components are NOT
interchangeable.
5. Remove the three (3) ”0”-rings (Parker # 2-011,
Viton 90 shore)
6. Remove both the adjustment hex caps and bonded
seal rings. (17 mm wrench)
7. Remove both the adjustment lock nuts and bonded
seal rings. (17 mm wrench)
8. Remove both the adjusting screws. (3-mm Allen
wrench)
Figure 5-31. Function Pump, Pressure and Flow Control - Sheet 3