Hydraulic Pump - TM-10-3930-631-340072

TM 10-3930-631-34

c. When the lift control lever is pulled to the rear, oil

will bring the mast to an upright position. Continued

forward movement will tilt the mast forward. On model

is delivered through the control valve to the two outer

ACE40AEE144 the mast will tilt 10 degrees forward and

cylinders of the cylinder cluster (fig. 7-1). Cylinder rams

3 degrees to the rear. Model ACE40AEE180 masts have

are forced upward, raising the chains and lifting the

a forward tilt of 6.5 degrees and a rearward tilt of 2

carriage up the mast. When outer cylinders have

degrees. Placing lever in neutral will hold mast at degree

reached their limit of travel, oil is delivered to the center

of tilt required.

cylinder. The center cylinder ram is forced down, lifting

e. The carriage is equipped with a side shift

inner mast, cluster cylinder, and carriage. At the center

cylinder limit of travel, the inner mast will be fully

cylinder. Pulling the control lever to the rear will send oil

extended. When this point is reached oil flows to the

to the shift cylinder and move the carriage to the right.

single lift cylinder, forcing its ram down. This action

Pushing the lever forward will move the carriage to the

raises the intermediate mast. Full extension of the ram

left.

will raise the mast and carriage to the highest level.

7-2. Hydraulic Pump

Placing the control lever in neutral will hold the mast in

a. Removal. Refer to paragraph 2-13 and remove

any position, with hydraulic pressure holding the mast at

the hydraulic pump.

the required height. Pulling lever to rear will allow oil to

b. Disassembly.

flow back to the reservoir through the control valve and

(1) Clean outside of pump with cleaning

the masts will lower under their own weight. Rate of

compound, solvent (Fed. Spec. P-D-680).

descent is controlled by a flow regulator. As the masts

(2) Scribe a mark across entire length of pump

descend they telescope into each other and the carriage

to assure proper positioning of parts at assembly.

lowers to the ground.

(3) Cover splines of drive gear (22, fig. 7-2) with

d. Pulling the tilt control lever to the rear will actuate

tape to protect splines while working on pump.

the tilt cylinders and pull the mast to a rearward tilt

position. Pushing the lever forward

7-3