TM-9-2320-285-10
TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1
TECHNICAL MANUAL; OPERATOR’S MANUAL
JUNE 1985
TM-9-2320-285-10 - Page 58 of 121
TM 9-2320-285-10
2-14.
OPERATING PROCEDURES (Continued)
b. Mobile Operation.
Familiarize yourself with the steering and performance of vehicle before doing any actual
towing.
Avoid sudden starts, stops, and turns except in an emergency.
CAUTION
Disengage power takeoff (PTO) if tractor is to be driven more than 1/2 mile with engine speed more than
2000 rpm.
Refer to step (14) of paragraph 2-14c below.
c.
Coupling to Trailer.
(1) Back the tractor up to front of trailer so that trailer kingpin is in line with fifth wheel jaws on tractor.
(2) Engage hydraulic pump power takeoff as follows:
(a)
Depress brake treadle, idle engine, and place gear shift lever in any drive position.
(b)
Pull PTO control out to engage power takeoff.
(c)
Place gear shift lever in neutral position.
(3) Momentarily depress brake treadle and FIFTH WHEEL CONTROL to unlock fifth wheel jaws.
CAUTION
Be sure gear shift lever is in neutral (N) position.
NOTE
To couple to a low trailer, perform step (4) below. Otherwise proceed to step (5) below.
2-38
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