TM-5-4210-249-13-P-1

TACTICAL FIRE FIGHTING TRUCK (TFF) MODEL M1142

TECHNICAL MANUAL; OPERATOR’S AND FIELD LEVEL MAINTENANCE MANUAL WITH REPAIR PARTS AND SPECIAL TOOLS LIST (INCLUDING DEPOT REPAIR PARTS AND SPECIAL TOOLS); PART 1 OF 4

TM-5-4210-249-13-P-1 - Page 491 of 1188

TM 5-4210-249-13&P-1

0081-1

DRAFT

0081

FIELD LEVEL MAINTENANCE

WATER PUMP ENGINE PRESSURE GOVERNOR CONTROL PANEL CHANGES ENGINE SPEED, BUT

OSCILLATES WHILE IN PSI MODE

INITIAL SETUP:

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MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

WATER PUMP ENGINE PRESSURE GOVERNOR CONTROL PANEL CHANGES ENGINE SPEED, BUT

OSCILLATES WHILE IN PSI MODE

Step 1.

Start water pump engine (WP 0022).

Operate pump operator’s panel pressure

governor in PRESSURE mode (WP 0024).

Check if pump operator’s panel pressure

governor oscillates when in PRESSURE mode.

If pump operator’s panel pressure governor oscillates when in PRESSURE

mode, go to Step 4.

Step 2.

Operate personnel cab pressure governor in PRESSURE mode (WP 0024).

Check if

personnel cab pressure governor oscillates when in PRESSURE mode.

If personnel cab pressure governor does not oscillate when in PRESSURE

mode, fault corrected.

Step 3.

Operate personnel cab pressure governor in RPM mode (WP 0024).

Check if

personnel cab pressure governor oscillates when in RPM mode.

a.

If personnel cab pressure governor oscillates in RPM mode,

troubleshoot Water Pump Engine Pressure Governor Control Panel

Changes Engine Speed, But Oscillates While In RPM Mode

(WP 0080).

b.

If personnel cab pressure governor does not oscillate in RPM mode,

adjust pressure governor parameters (WP 0193).

Tools and Special Tools

Tool Kit, General Mechanic’s: Automotive

(WP 0622, Item 27)

References

WP 0022

WP 0024

WP 0080

WP 0193

Equipment Conditions

Water pump engine OFF (WP 0022)

Engine OFF (TM 9-2320-347-10)

Wheels chocked (TM 9-2320-347-10)