TM-5-3805-254-14-P-2

TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)

TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)

JUNE 1980

TM-5-3805-254-14-P-2 - Page 547 of 894

TRUCK SERVICE MANUAL

FUEL SYSTEM

at by-pass opening or closing to differ depending upon

whether air pressure is increasing or decreasing.

A.

If air actuation pressure is to high, screw two piece shaft

1/4 turn, remove aneroid shims, Part No.

144921, or add a

washer, Part No.

67684 as shown in assembly drawing.

If air’

actuation pressure is too low, add shims or lengthen shaft.

If

capscrew securing shaft to bellows is removed, retorque 20 to

25 in.

lbs.

(2.3 to 2.8 Nm)

B.

The

proper

aneroid

spring

must

be employed

as specified.

Table 522.

Table 5-2-2: Aneroid Bellows Spring Specifications

Wire

Free

Dia

Load

Color

Length

In

Lb. @ In

Part No

Code

Coils

In [mm]

[mm] [kg @ mm]

124033

Green

6

1.375

088

8.18@1.00

[35]

[2.24]

[3.71@25.4]

Checking Starting Check Valve

1.

To check aneroid starting check valve action, stop

fuel pump test stand and set air regulator to 0 inches of

mercury.

Disconnect aneroid fuel return line at fuel pump and

plug opening In gear pump inlet suction fitting.

2.

Move aneroid supply line from bottom of housing to

fuel pressure check point on shutdown valve.

Plug hole In

bottom of housing.

Note:

The current check valve, Part no 216737, Is not

interchangeable with the older style check valves.

3.

Open rail flow valve on test stand completely, open

rail flow snubber valve and hold pump throttle wide open.

4.

Start test stand at lowest possible speed setting, rail

pressure must be less than 10 psi (69 kPa).

5.

Observe fuel discharge from aneroid hose.

There

should be only a slight dribble of fuel which Is leakage.

If

valve is stuck open, free flow of fuel will occur.