TM-9-2320-272-10

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; OPERATOR'S MANUAL

SEPTEMBER 2004

CHANGE 2

TM-9-2320-272-10 - Page 245 of 481

TM 9-2320-272-10

2-144

2-24. OPERATION OF MEDIUM WRECKER (Contd)

f.

Securing Crane After Operation.

(1)

Secure outriggers (4), two boom

jacks (3), tie bar (6), and boom jack base plates (5).

Refer to step d.

NOTE

When retracting boom, pull

crowd control lever back to

RETRACT and hoist control lever

back to UP to prevent block from

becoming tangled.

(2)

Fully retract boom (1) into shipper (2) and

center boom (1) to rear of wrecker.

(3)

Remove retaining clip (11) from upper

retaining brackets (7) and swing shipper braces (8) to

shipper brace brackets (9) on wrecker body. Secure

shipper braces (8) in place with L-shaped retaining

pins (10) and retaining clip (12).

(4)

Push boom control lever (17) forward to

DOWN to allow shipper braces (8) to support boom

(1) and weight of shipper (2).

(5)

Install lifting sling (15) onto crane block

hook (14). Attach hook ends of sling (15) to brackets

(16) on outrigger (4).

(6)

Pull hoist control lever (18) back to UP

and remove all slack from lifting sling (15) and boom

cable (13).