WATER PUMP - TM-5-6640-213-140144

TM 5-6640-213-14

d. Turn the apparatus on its side so that the internal compo-

nents located at the bottom are accessible (fig. 4-8).

With the aid of the volt-ohm multimeter, supplied with the

laboratory, perform continuity and short tests of the items suspected

of not working.

To replace the switch (fig. 4-9), press the side holding

springs on switch, from the inside of the apparatus and push out on

the switch until free of stainless steel housing. Tag wires, then

loosen screws and remove.

To remove auto-transformer proceed as follows:

(1) Loosen setscrew holding knob on the auto-transformer

(2) Remove nut and washer located under knob, lift off

heat range dial and push auto-transformer shaft through stainless

steel housing.

(3) Tag wiring to auto-transformer (fig. 4-10).

(4) Disconnect wiring connector (fig. 4-11) from wiring

harness going to heater element and auto-transformer.

h. Remove heater aboard (fig. 4-12) by carefully pulling up and

out of apparatus. Turn board sideways and remove heavy wire leads

coming from auto-transformer. When leads are free from heater board,

board can be lifted free of apparatus.

i. Install all items in the reverse order of removal. After

apparatus is assembled and tested, attach to counter top, and install

cabinet drawer to slide assembly with four screws, washers, and nuts

4-11

WATER PUMP.

The water pump requires no lubrication.

a. Before-Operation Service.

Check electrical connection to

pump motor.

b. During-Operation Service.

Inspect pump and motor assembly,

being alert for unusual noises or smells that could indicate malfunc-

tion. Check pump for leaks at shaft.

Overtightening of packing nut may cause motor dam-

age. Tighten packing nut with motor operating just

enough to stop leak.

c. After-Operation Service. Refill reservior with potable

water. Inspect pump and motor for leaks. Make necessary repairs.