TM-9-2320-279-10-2

M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)

OPERATOR’S MANUAL VOLUME 2 OF 2

DECEMBER 1998

CHANGE 3

TM-9-2320-279-10-2 - Page 765 of 819

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TM 9-2320-279-10-2

Troubleshooting Malfunctions (Cont)

Table 3-4. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

MATERIAL HANDLING CRANE (M984E1) (CONT)

BOOM RAISES OR LOWERS SLOWLY.

2 .

Step 1. Check outside temperature. If temperature is less than

0

0

F

(– 17

0

C), hydraulic oil

may not flow easily.

Operate engine for 20 minutes with PTO ENGAGE switch

set to ON to bring oil to operating temperature.

If oil is still not warmed, lower crane to stowed position.

Operate MAST control DOWN. Hold MAST control DOWN

for approximately 30 seconds, then return control to

neutral position. Repeat procedure several times until oil

is warmed.

Step 2. If problem remains, notify organizational maintenance.

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