CHAPTER 7 REPAIR OF CARRIAGE ASSEMBLY, BOOM ASSEMBLY, FRAME, HOOD, AND PANELS

TM 10-3930-242-34

CHAPTER 7

R E P A I R OF CARRIAGE ASSEMBLY, BOOM ASSEMBLY, FRAME, HOOD, AND PANELS

Section I. CARRIAGE AND BOOM ASSEMBLIES

7-3. Boom Assembly

7 - 1 . General

a. General. The boom assembly serves as an

The carriage assembly and the boom assem-

i n t e r m e d i a t e load supporting member between

bly work together to form the load retrieval,

t h e frame of the lift truck and the carriage as-

lifting, and carrying members of the forklift

s e m b l y . It also is the member that provides for

truck. These are the members that do the actual

the extension and retraction of the forks, as well

l i f t i n g and positioning of the load. The load

as the tilting of the carriage assembly and forks,

f o r c e s arc transmitted by these members to the

b. Removal.

f r a m e of the forklift truck.

(1) Remove the carriage assembly (TM

7-2. Carriage Assembly

10-3930-242-12).

(2) Remove the boom assembly (para 2-8).

a. General. The carriage assembly includes

c. Disassembly. Refer to figure 7-2 and disas-

t h e forks and is the unit that immediately con-

s e m b l e the boom assembly.

t a c t s and carries the load. It is the unit that

d. Cleaning and Inspection.

provides for the side shifting of the forks and for

t h e immediate support of the load.

(1) clean all parts thoroughly, using sol-

v e n t P-D-680, or equal.

b. Removal. R e m o v e t h e c a r r i a g e a s s e m b l y

(2) Remove rust deposits with a wire brush.

(TM 10-3930-242-12).

(3) Inspect the inner boom for cracks,

c. Disassembly. Refer to figure 7-1 and disas-

breaks, broken welds, distortion, and for worn or

s e m b l e the carriage assembly.

pitted upper or side wear strips. (These are

d. Cleaning and Inspection.

w e l d e d to the inner boom and may be removed

(1) Clean all parts thoroughly, using sol-

o n l y by use of a cutting torch. Wear is usually

v e n t P-D-680, or equal.

l o w and replacement is seldom required.)

( 2 ) Use a wire brush to remove rust de-

(4) Inspect the outer boom for cracks,

posits.

b r e a k s , broken welds, distortion and other dam-

( 3 ) Inspect the carriage frame and the two

age.

a r m s for cracks, breaks, distortion, and dam-

( 5 ) Inspect the small components for wear,

aged or broken welds.

distortion and other damage.

(4) Inspect the clevis for breaks and distor-

(6) Weld cracks in the inner or outer boom.

tion.

After welding, remove flux deposits, In areas

(5) Inspect the sprockets for wear and other

t h a t form a sliding surface, carefully grind the

damage.

w e l d s smooth. Then, inspect the welded areas

( 6 ) Inspect the small components for wear,

w i t h the magnaflux or dye penetrant inspection

d i s t o r t i o n , and other damage.

process.

( 7 ) Weld cracks in the carriage frame or

( 7 ) Replace all defective parts.

f o r k s . After welding, remove flux deposits and

e. Reassembly, Refer to figure 7-2 and reas-

i n s p e c t the welded areas with the magnaflux or

s e m b l e the boom assembly.

dye penetrant process.

Installation.

( 8 ) Replace all defective parts.

(1) Install the boom assembly (para 2-8).

e. Installation. Install the carriage assembly

(2) Install the carriage assembly (TM

10-3930-242-12).

(TM 10-3930-242-12).

7-1