CHAPTER 2. OPERATING INSTRUCTIONS - TM-5-4320-258-120018

CHAPTER 2

OPERATING INSTRUCTIONS

Section I. SERVICE UPON RECEIPT OF MATERIEL

2-1. Inspecting and Servicing the Equipment

result in inefficient operation of the engine

lubrication system and may cause severe damage to

the engine or automatic shutoff due to low oil

a. Inspect the unpacked pump assembly as

follows:

pressure.

(1) Inspect for cracks, dents, and other

b. Connect the suction line to the suction port (fig.

damage that may have occurred during shipment.

1-1), as follows:

(2) Inspect for loose or missing hardware.

(3) Check the engine for leaking.

(1) The suction port is provided with a 6-inch

(4) Inspect the suction and discharge ports of

grooved nipple. Connect to mating grooved pipe with

pump for damaged ends and burred grooves.

lock ring.

(5) Using the engine crank (fig. 1-2), turn

(2) Keep the suction line as short as possible

over the engine with the battery disconnect switch and

and the suction lift as low as possible. Reduction in

ignition switch in the OFF positions. The engine and

pumping capacity becomes noticeable at suction lifts in

pump shall turn freely without binding or scraping or

excess of 15 feet and is very pronounced at 25 feet. Do

other signs of faulty operation. Be careful that the crank

not operate the pump with a suction lift in excess of 25

does not drop onto the fuel gage on the fuel tank.

feet.

(6) Inspect the control panel (fig. 1-1) for

(3) The suction line should be as large a

damaged controls and instruments.

diameter and as short as practical, and should be

(7) Remove the engine side panels (fig. 1-2).

installed with as few bends as possible. Use no fittings

Inspect all hoses for abrasions, cracks, fraying, and

of less than a 6-inch diameter.

other damage.

(4) The highest point in the suction line

(8) Tighten all loose hardware. Report any

should be at the pump, and the line should be laid in a

other damage to the required authority.

decline from the pump to the source. Avoid high points

b. Servicing.

which will form air pockets.

(1) Refer servicing of the equipment to

(5) Make sure that connections in the suction

organizational maintenance.

line are air tight. Even a small leak will greatly reduce

(2) Perform all daily preventive maintenance

pumping efficiency and may cause difficulty in priming,

services indicated in table 3-1.

especially when operating with a high suction lift.

(6) Support the suction line at or near the

2-2. Installation

pump to prevent strain.

Install the centrifugal pump as follows:

c. Install the discharge line on the discharge elbow

(fig. 1-1), as follows:

a. Locate the pump assembly on a solid, flat

surface as close as possible to the source of liquid

(1) The discharge elbow is provided with a 6-

supply. Allow ample room around the pump to support

inch grooved pipe. Connect to mating grooved pipe with

the suction and discharge hoses and to service the

lock ring.

pump as required.

(2) Avoid unnecessary fittings in the

discharge line. When necessary to use elbows, use

Caution: The tilt of the pump when spotted for

long radius type to reduce friction loss.

operation shall not exceed 15 degrees from

horizontal. An angle of more than 15 degrees will

2-1