JLG 1100S Service Manual - Manual (Page 259)

SECTION 5 - HYDRAULICS
3121256 – JLG Lift – 5-37
to reassembly. Make sure 0-rings are completely seated in
their grooves.
Withdraw pinion shaft and inspect gear teeth and bearing
surfaces for abnormal wear.
When reassembling, make sure chamfer (on outer edge of
driven gear and drive gear) is installed into housing per
illustration.
Torque value for bolts when replacing charge pump.
NOTE: If serious wear or damage has occurred to one com-
ponent, the complete charge pump assembly must
be replaced because they are matched compo-
nents.
Routine Maintenance
The Variable Displacement Hydrostatic Transmission
Pumps are relatively maintenance free. Maintenance work
is confined to the system, by way of maintaining hydraulic
fluid condition, the "life blood" of the machine. Oil monitor-
ing, changes and filter renewal promote system cleanli-
ness. This will prevent premature breakdown and repairs.
Under normal application conditions, the following main-
tenance intervals are suggested:
1. Renewal of Filter Elements
a. After commissioning or re-build.
b. At every 500 operating hours or when filter indi-
cator shows a dirty element.
c. With the suction strainer, the strainer should be
renewed as soon as charge pump inlet pressure
is less than -3.2 psi, 6.3"Hg or 0.8 bar absolute.
d. Only JLG recommended filter elements are to be
used. Paper elements cannot be cleaned; use
throwaway cartridges.
2. Hydraulic Fluid Change
a. After 2000 operating hours (1 st oil change)
b. Thereafter, every 2000 operating hours or annu-
ally, irrespective of operating hours achieved.
c. Oil change should be performed with the system
in warm running condition. Before re-filling, the
reservoir interior should be inspected and
cleaned to remove any sludge.
d. Rags or threaded material must not be used.
e. This machine has been designed & manufac-
tured to operate on an Exxon-Mobil Oil Co.
hydraulic fluid, Mobilfluid #424, Product
#52233-4. Consult JLG Industries prior to intro-
ducing any other type of fluid to prevent interac-
tion or possible contamination.
f. The recommended interval between oil changes
is based on various factors and should be car-
ried out according to the degree of aging, con-
tamination and water content.
Pump Size Torque
28 18 ft.lb. (24 Nm)