SPECIFICATIONS

Vehicle Systems Systems Operation

Full Free Triple Lift Mast In The Extended Position

(Typical Example)

(3) Primary lift cylinder. (5) Intermediate mast. (6) Inner mast.

(7) Secondary cylinder.

The oil under pressure in the primary and secondary

cylinders is released when the lift control lever is

moved forward. Gravity and the weight of a load will

cause the cylinders to move back into their housings.

The secondary cylinders move completely back into

their housings before the primary cylinder starts to

move down. The flow regulator valve, located

between the outer mast near the base of the lift

cylinders, permits 54 to 66 liter/min (14 to 17 U.S

gpm) of oil to flow back through the control valve and

into the hydraulic tank.

The Full Free Lift and Full Free Triple Lift Masts also

have excess flow protectors connected to the prima-

ry lift cylinder and in the inlet of the secondary lift

cylinders. They will act as a lowering flow control

valve if an oil line is broken between any of them and

the flow regulator valve located near the base of the

lift cylinders.

The carriage and inner mast move up and down

smoothly on load bearings (rollers). Stability of the

mast and carriage is controlled by bearing size and

shims behind the bearings (rollers).

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