FAN SHAFT REPLACEMENT

TM5-4110-234-14

TO 40R7-5-7-1

Lift the bell-crank armature off.

Lift the contact assembly out and inspect for pitting, corrosion and obvious defects or wear. If they are bad

replace them. Do not attempt to file or dress these contacts.

If replacement of any contact is indicated it is recommended that the complete set be replaced.

Reverse the procedure to reassemble.

5-4.

FAN SHAFT REPLACEMENT

Removal. (See figs. 54 and 4-22 or 4-23 as applicable).

(1) See paragraph 5-13 and remove the condenser coil and shroud.

(2) See paragraph 4-41 and remove the evaporator fan.

(3) See paragraph 4-50c and remove all items necessary to remove the flange bearing.

(4) Slip the fan shaft out of the condenser coil opening.

Installation.

(1)

Slip the flange bearing onto the fan shaft and see paragraph 4-50d for installation of fan shaft drive

items.

(2)

See paragraph 4-41 and install the evaporator fan.

(3)

See paragraph 5-13 and install the condenser coil and shroud.

5-5.

REFRIGERATION SYSTEM REPAIRS

The refrigeration system must be pumped down and in some actions totally discharged before any maintenance

is performed on system components. Be sure that all refrigerant in the section of the system that you are working on has

been discharged. Read and understand all instructions prior to attempting repairs. Leak testing and dehydrator

replacement are required after any system component has been removed and replaced. The section of the system that

was opened must be evacuated before it is charged. The system must be properly charged to function properly.

DANGEROUS CHEMICAL

is used in this equipment

DEATH

or serious injury may result if

personnel fail to observe proper safety precautions. Great care must be exercised to prevent contact of

liquid refrigerant, or refrigerant gas discharged under pressure, with any part of the body. The extremely

low temperature resulting from the rapid expansion of liquid refrigerant, or refrigerant gas released under

pressure, can cause sudden and irreversible tissue damage through freezing. As a minimum, all

personnel must wear thermal protective gloves and a face shield or goggles when working in any situation

where refrigerant contact with the skin or eyes is possible. Application of excessive heat

to any

component in a charged system will cause extreme pressure that may result in a rupture, possibly

explosive in nature. Exposure of Refrigerant-12 to an open flame or a very hot surface will cause a

chemical reaction in the gas to form carbonyl chloride (phosgene), a highly toxic and corrosive gas. In its

natural state, Refrigerant-12 is a colorless, odorless vapor with no toxic characteristics. It is lighter than

air and in a well ventilated area will disperse rapidly. However, in an unventilated area it presents danger

as a suffocant.

5-3