TM-9-2350-311-20-2

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS

DECEMBER 1993

TM-9-2350-311-20-2 - Page 805 of 828

TM 9–2350–311–20–2

Change 2

J–5

J–1

RECOIL EXERCISER INSTRUCTIONS – CONTINUED

b.

Operation

1

Release cannon tube (2) from travel lock (25) and position cannon tube at the same elevation as when held

by travel lock. Stow travel lock.

2

Place chalk markings on cannon tube (2) 12 and 14 inches (30.4 and 35.56 cm) from front of dust cover (5).

CAUTION

Breech must be closed prior to pumping to prevent damage to operating cam rollers.

3

Close breech (26).

WARNING

Cylinder support assembly has moving parts. Keep clear of cylinder support assembly during op-

eration to avoid injury.

NOTE

•

The electric hydraulic pump has a three position REMOTE ON-OFF-MOMENTARY ON switch.

To operate the electric hydraulic pump using the remote control, place the REMOTE ON-OFF-

MOMENTARY ON switch in the REMOTE ON position. To operate the electric hydraulic pump

without the remote control, hold the REMOTE ON-OFF-MOMENTARY ON switch in the MO-

MENTARY ON position.

•

Make sure quick disconnect couplings are fully seated.

4

If using electric hydraulic pump (22), place manual valve (27) in upright position. Using the electric hydraulic

pump, begin pumping. During pumping, check for hydraulic leaks. If leaks are found, slowly release hydrau-

lic pressure and replace defective parts.

5

Continue pumping until front of dust cover (5) is between the chalk markings.

6

Inspect buffer piston rod (28) for discoloration. If no discoloration is found, skip to step 9.