preassembly

TM 10-3990-203-13&P

d. The lift ring mounting plate assembly (5) can

g. Place a 3/4 inch s o c k e t and ratchet over

now be removed from frame bracket (8).

mounting bolts (2).

e. Refer to the parts list for replacement parts.

h. Loosen and remove locknuts (3) and bolts (2).

5.5.3.2

preassembly

i. Swing hydraulic lift cylinders (1, Fig. 5-13)

clear of the undercarriage assembly (Fig. 5-6) and

a. Insert mounting bolts (6) through the holes in

pull the undercarriage from underneath the ramp.

mounting plate (5) and frame bracket (8).

NOTE

b. Thread locknuts (7) onto the ends of bolts (6).

Tighten by hand.

It is necessary to remove the undercarriage

only when repairing a cracked or broken weld

c. Place a 3/4 inch box wrench on locknuts (7)

on the yoke assembly or when a damaged axle

and a 3/4 inch socket and ratchet over bolts (6) and

requires replacing the yoke assembly.

tighten securely.

j. Loosen and remove grease fittings (7, Fig. 5-6)

5.5.4 Reflector Assembly (Fig. 5-5)

from pivot tube.

5.5.4.1

Disassembly

k. Remove cotter pins (6) from pivot pins (5).

a. Using a medium, flat tip screwdriver, loosen

l. Remove mounting blocks (1) from the ends of

and remove pan head screw (2) from the center of

pivot pins (5).

reflector (1).

m. Slide pivot pins (5) f r o m pivot tubes and

b. Refer to the parts list for replacement parts.

remove spacer washers (4).

5.5.4.2

Reassembly

a. Insert pan head screw (2) through the center of

reflector (l).

Place the undercarriage up on blocks high

b. Thread screw (2) into frame.

enough to allow the wheels to turn before

proceeding.

c. Tighten screw (2) with a medium, flat tip

screwdriver.

n. Remove tire and rim (1 and 2, Fig. 5-7) and

5.5.5 Undercarriage Assembly (Fig. 5-6)

hub assembly (3) from axle by removing rim bolts

(9) and rim clamps (10).

5.5.5.1

Disassembly

o. Refer to parts list for undercarriage replace-

ment part number.

a. Using the hydraulic pump, elevate the ramp

enough to clear the wheels.

5.5.5.2

Reassembly

b. Support the elevated end with blocks.

a. Install tire and rim (1 and 2, Fig. 5-7) and

hub assembly (3) to axle by using rim clamps (10)

and rim bolts (9).

b. Insert pivot pins (5, Fig. 5-6) through pivot

Secure the ground end of the ramp to prevent

the ramp from sliding off the blocks.

tubes placing spacer washers (4) over the ends of

pivot pins.

c. Place the pump control valve in the LOWER

position.

c. Slide mounting blocks (1) over the ends of pivot

pins (5).

d. Remove cotter pins (10) from lower clevis

pins (9) holding hydraulic lift cylinders (Fig. 5-6).

d. insert cotter pins (6) through the holes in the

ends of pivot pins (5). Secure cotter pins.

e. Slide clevis pins (9) out.

e. Take the undercarriage off the blocks and place

NOTE

it into position under the ramp.

The hydraulic cylinders will be left attached

f. Align the holes in mounting blocks (1) with the

to the ramp frame.

holes in ramp frame.

f. Place a 3/4 inch box wrench over locknuts (3).

g. Insert bolts (2) through the holes.

5-6