BEARING ADJUSTMENT (TRI-MAX MAST)

TM 10-3930-644-14&P

5. After the adjustment is completed, tighten the

locknuts securely and make certain adjustments

were not turned.

G. BEARING ADJUSTMENT (TRI-MAX MAST)

1. Cuter Mast Assembly. Use an adjustable inside

spanning tool and check the rear inside of the

outer mast upright to find narrowest distance

between uprights. Lock tool in this position. Set

an adjustable outside spanning tool to match

Figure 2. Setting Outside Spanning Tool

inside spanning tool. Lock tool in this position.

equally as possible under both bearings to

2. Intermediate Mast Assembly. Install bearings on

provide maximum .015 inch clearance.

studs located at bottom of intermediate mast

assembly. Use an outside spanning tool as set

4. Inner and Intermediate Mast Bearings. Perform

in Step I above and span bearings at maximum

Steps 2 and 3 to adjust upper bearings on inside

camber point. Shim bearings, if required, to

of intermediate mast and lower bearings on

obtain maximum .015 inch clearance between

inner mast.

bearings and outside spanning tool. Divide

shims as equally as possible between bearings.

5. Carriage Assembly Bearings.

Use inside

Shims available in 0.015 and 0.

040 inch

spanning tool and check inside of web of inner

thicknesses.

mast assembly and determine narrowest point.

Set outside spanning tool to match Inside

NOTE

spanning tool. Lock tool in position. Install

If odd shim is required, place odd

bearings on roller studs on carriage. Span

shims on same side of all mast

bearings on carnage assembly at the maximum

sections and carriage so mast will be

camber point with outside spanning tool. Span

in balance.

all three sets of bearings. Shim bearings to

produce maximum .015 inch clearance with

3. Cuter Mast Assembly Top Bearing. Use outside

spanning tool. To check bearing alignment,

spanning tool and find widest point in outside

place a straightedge against stud centerline to

width of web on intermediate mast assembly.

all three bearings on both sides of carriage

Install bearings on studs at top inside of outer

assembly.

No visible gap should be seen

mast. Use inside spanning tool to span bearings

between bearings and the straightedge.

at maximum camber point. Check clearance

between outer and inner spanning tools.

6. After assembly raise and lower the mast and

Measure clearance accurately and install shims

carriage several times to check for free

to provide proper clearance. Install shims as

movement throughout the entire range of travel

TOPIC 2. LIFT CYLINDERS

A. DESCRIPTION

A flow regulator, which is located at the oil inlet port of

the lift cylinder(s), controls the flow of hydraulic nil so

Various renderings of the lift cylinder mechanism are

that the load lowers at a controlled rate of speed from

available depending on the type of mast assembly used

the raised position.

on the lift truck. All lift cylinders operate by the same

hydraulic principles regardless of their multiplicity or

B. SERVICE

arrangement.

After each 50 hours of operation, inspect the mast lift

cylinder(s). cylinder hoses and fittings for evidence of

The hydraulic oil enters the lift cylinder(s) at, or near.

leaks and repair as necessary.

the base of the cylinder(s) causing the plunger(s) to

extend.

The following procedures are recommended for the

proper removal of the respective lift cylinders noted:

3-192