SECTION 5 - HYDRAULICS
5-4
– JLG Lift –
3121623
5.2
HYDRAULIC SYSTEM PUMP AND PRESSURE
LINES
The machine hydraulic system is powered by n.3 pumps
units:
•
Pumps unit connected to the diesel engine, n.2
pumps 6,67cc/rev each, diesel engine is calibrated at
maximum 3200 rpm
•
Pumps unit connected to the electric motor, n.2
pumps 2,15 cc/rev each, electric motor is calibrated at
1500 rpm
•
Emergency hand pump, this has only one outlet line
but it’s equipped with a deviator to select which one
of the two lines should be fed
NOTE:
Lithium machine are equipped only with n.2 pumps
unit, one connected to the electric motor with n.2
pumps 3,15 cc/rev each and the hand pump.
All of the pump unit pressure lines are conveyed through
the hydraulic manifold into two pressure lines A and B. Six
one-way valves avoid oil under pressure to flow back to
the tank through an unused pump unit.
Every time that hydraulic oil tank is opened (depressur-
ized), such as in case of hydr. oil filter replacement, it must
be pressurized again (with cork screwed) at minimum
rpm, to avoid cavitation.
“A” OULINE
“B” OULINE
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