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 534 of 894

TRUCK SERVICE MANUAL

Adjust suction valve to 5" Hg.

or as close as possible.

4.

To adjust pressure to specifications, stop test stand

and remove the throttle shaft.

5.

Remove shims from the restriction plunger inside the

throttle shaft and replace assembly in fuel pump.

Reset

suction restriction valve to 5 inch [12.7 cm]

Hg. after

setting internal throttle restriction.

Repeat pressure

check and continue to remove or add shims until

pressure indicated is 3 to 6 psi above "Manifold psi @

rpm value stated.

a.

After

each

adjustment,

reset

flow

as specified

in

calibration data, while maintaining vacuum at 5 inch 12.7

cm Hg.

b.

If throttle shaft does not contain the restriction

plunger, turn pump rear throttle screw until fuel manifold

pressure and pump rpm

is indicated by "Manifold psi @

rpm" in the calibration data.

Lock throttle rear screw in

place.

G-2.

Adjust Final Fuel Manifold Pressure With Rear

Throttle Screw

1.

After Step G1, where throttle shaft contains the

internal restriction plunger, with pump running at speed

indicated by “Fuel Manifold Pressure”, turn in rear throttle

screw until fuel pressure is reduced to value indicated.

Fig. 5-123.

Lock screw in place.

2.

Steps G-1 and G-2 are both necessary to properly

position the rear throttle screw where the throttle shaft

contains the internal restriction plunger.

3.

Recheck governed speed and pressures