Cleaning and Inspection - TM-10-3930-632-340037

TM 10-3930-632-34

inner rail (22) and outer rail (23). Position the outer rail

WARNING

on the inner rail so that the inner rail rollers slide in the

outer rail track. Move the outer rail along until it contacts

Dry cleaning solvent, P-D-680, used to clean

the stop pads. It must move freely, without binding or

parts is potentially dangerous to personnel and

drag. If binding or dragging is present, check welds or

property. Avoid repeated and prolonged skin

bends made during repair; correct the cause of drag or

contact.

Do not use near open flame or

excessive heat. Flash point of solvent is 100 F.

bind.

b. Turn the inner and outer rail assembly over

- 138 F. (39 C. - 59 C.).

and block the outer rail so that it is level and the trunnion

brackets are clear of the ground. Slide the outer rail

3-4. Cleaning and Inspection

down until the rollers stop it; support the outer rail so that

it is level. Use a pry bar to move the inner rail fully to one

a. Clean all metal parts of the mast assembly,

side. Maximum clearance between rails and rollers on

except the rollers, with cleaning solvent P-D-680. Wipe

the side forced apart is 1/32 inch. Check for this

off dirt, dust, and grease and oil deposits.

clearance on the full length of the inner rail for the outer

b. Clean the rollers by wiping with a cloth

rail roller, and down to 20 inches below the outer rail

dampened in cleaning solvent P-D-680.

rollers for the inner rail rollers. Add or remove shims

c. Inspect all metal parts for wear, distortion, or

behind the rollers to maintain this maximum clearance.

other damage; replace defective parts.

Check again for clearance; readjust if necessary.

d. Inspect the trunnion bushings for wear,

scoring, distortion, or other damage; replace bushings if

NOTE

damaged.

The inner rail is made with a slight taper so that the

e. Inspect stop pads for wear, cracks, distortion,

bottom is wider than the top. Make the outer rail

or other damage; replace damaged stop pads.

roller adjustments with the inner rail in the fully

f. Inspect inner and outer rail assemblies for

extended position or the rail will bind when

cracks, breaks or distortion; repair inner and outer rails

reassembled.

by welding or straightening. Replace rails if they cannot

be repaired.

3-6. Installation

3-5. Reassembly

Install the mast assembly (para 2-6b ).

Refer to figure 3-1 and reassemble the mast

assembly. Note the following:

a. Place the shims (8) and two rollers (7) on the

3-3