TM-9-2320-279-10-1

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

OPERATOR’S MANUAL VOLUME 1 OF 2

DECEMBER 1998

CHANGE 5

TM-9-2320-279-10-1 - Page 313 of 773

TM 9-2320-279-10-1

M977 and M985 Tanker Operating Procedures

2-18. M977, M985 CRANE OPERATION (MANUAL CONTROLS) (CONT).

CAUTION

Keep hook block at least 2 ft (0.61 m) from end of boom.

If hook block hits end of boom it may damage cable or

hook block and crane will lose power. Wait 6 seconds for

power to return and check crane for damage.

NOTE

When crane is overloaded, M977 and M985 overload

systems will automatically shut off power to telescope

boom out, raise boom, or hoist load any higher. The

M977 overload system will also prevent lowering

boom. Overload condition can be corrected by

lowering load to ground or other supporting surface

by using hoist control level only.

When telescoping the boom, the TELESCOPE and

HOIST control levers should be operated at the same

time.

Crane movement from one lever may be slower than

the other when operating two levers together.

(3)

Move TELESCOPE control lever (3) to OUT position to extend

boom (2) and move HOIST control lever (4) to DOWN position to pay

out cable (5).

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