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 538 of 894

TRUCK SERVICE MANUAL

FUEL SYSTEM

specifications at second check point, (i.e.; 7581 PSI @ 1500

RPM can be 7481 at recheck).

c.

If pump checks within the published tolerance at first

check point, it must check within the published tolerance at

second check point.

6.

Manifold Pressure At Weight Assist Check Point

Recheck of the manifold pressure at the weight assist check

point can vary + 1 PSI from the published specification.

(i.e.

35-41 PSI manifold pressure can be 34-42 PSI at reflow)

Check Pump Seals

1.

With test stand operating at 500 rpm, close vacuum

value in fuel pump suction line till vacuum gauge reads 15

inches vacuum.

The fuel flow control or needle value should

be open during this check.

2.

Put a small amount of Lubriplate or light cup grease

over the vent or "weep" hole at main shaft seal bore of fuel

Pump cover.

Fig.

5132.

3.

If the lubricant is sucked into the hole at the 15 inch

vacuum setting, it is an indication that the seal will not permit

proper engine performance and should be replaced.

4.

The above check may also be performed on the

throttle shaft to check the shaft "O" ring.

Apply lubricant at the

throttle bushing to shaft outside diameter.

5.

Fill the tachometer seal bore with test oil from test

stand, If the fluid is drawn Into the pump, replace the seal.