Routine Maintenance - JLG 1200SJP Service Maintenance Manual

SECTION 5 - HYDRAULICS
sembly. Make sure 0-rings are completely seated in their
grooves.
Withdraw pinion shaft and inspect gear teeth and bearing sur-
faces for abnormal wear.
When reassembling, make sure chamfer (on outer edge of
driven gear and drive gear) is installed into housing per illus-
tration.
Torque value for bolts when replacing charge pump.
Pump Size
28
NOTE: If serious wear or damage has occurred to one component,
the complete charge pump assembly must be replaced
because they are matched components.
5-38
Torque
18 ft.lb. (24 Nm)
– JLG Lift –

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 monitoring, changes and
filter renewal promote system cleanliness. This will prevent
premature breakdown and repairs. Under normal application
conditions, the following maintenance intervals are sug-
gested:
1. Renewal of Filter Elements
a. After commissioning or re-build.
b. At every 500 operating hours or when filter indica-
tor 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 throw-
away cartridges.
2. Hydraulic Fluid Change
a. After 2000 operating hours (1
b. Thereafter, every 2000 operating hours or annually,
irrespective of operating hours achieved.
c. Oil change should be performed with the system in
warm running condition. Before re-filling, the reser-
voir 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 & manufactured to
operate on an Exxon-Mobil Oil Co. hydraulic fluid,
Mobilfluid #424, Product #52233-4. Consult JLG
Industries prior to introducing any other type of
fluid to prevent interaction or possible contamina-
tion.
f. The recommended interval between oil changes is
based on various factors and should be carried out
according to the degree of aging, contamination
and water content.
st
oil change)
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