JLG 1500SJ Service Manual - Manual (Page 439)

SECTION 5 - HYDRAULICS
3121262 – JLG Lift – 5-87
g. Under application conditions with a heavy
occurrence of dust or severe temperature fluctu-
ations, the intervals between fluid maintenance
should be shortened accordingly.
PRACTICAL EXPERIENCE SHOWS THAT MOST FLUID MAINTE-
NANCE ERRORS OCCUR DURING AN OIL CHANGE DUE TO:
• USE OF AN UNSUITABLE HYDRAULIC FLUID
• USE OF OIL CONTAMINATED DUE TO POOR STORAGE PRAC-
TICES
• FAILURE TO CLEAN THE RESERVOIR
• INADEQUATE CLEANLINESS WHEN FILLING THE RESERVOIR
(DIRTY DRUMS, CONTAINERS, WATER, ETC)
3. Leakage Inspection
a. After commissioning
b. The complete transmission drive system
(pumps, motors, hosing, filters, valves, etc.)
should be checked for leakage at regular inter-
vals.
c. Leaking joints & connections must only be tight-
ened when pressureless.
4. Cleanliness Inspection
a. The oil tank breather should be regularly
cleaned of dirt and dust to prevent clogging.
With each cylinder movement, gallons of oil
pumped, an equal amount of air exchange
occurs across the reservoir breather. A dirty or
clogged breather will affect all machine func-
tions!
b. The air/oil cooler surfaces and engine radiator
should be cleaned at the same time.
c. If hose connections are disassembled, it is
imperative that the utmost care be taken that no
foreign bodies infiltrate the oil circuit. Cata-
strophic component failure may occur.
5. Oil Level Inspection
a. Inspect oil level in the reservoir daily.
b. If "topping off" is required, use only the same
Mobilfluid #424, Product #52233-4.
c. Do Not Mix Fluids.
6. Hydraulic Fluid - The "Life Blood" of the Machine
a. The type of hydraulic fluid supplied in the
machine from the factory was selected after
extensive testing and development. The fluid
was selected to perform under "most" applica-
tions and conditions. Should this machine be in
service for extended time periods at the
extremes (hot or cold), JLG should be consulted
for assistance in selection of the most suitable
fluid type and grade for your application.
b. When operating at temperatures below 0 o F,
allow a warm-up period, if at all possible, to a
temperature of 40
o F.
c. When beginning motion of a "cold" machine,
operate all functions at reduced speeds until the
"cold" oil has circulated out of the drive loop.