TM10-3930-660-20 15-3. COUNTERWEIGHT - REPLACE (Cont’d) 5. CAREFULLY REMOVE COUNTERWEIGHT (1) FROM THE VEHICLE. Back lifting forklift away from the vehicle and then lower counterweight (1) to the ground. INSTALLATION Use extreme care when lifting counterweight (1) with a forklift. Never allow forks to tip forward. Always tie counterweight top mount pin holes to the lifting forklift. When placing forks in counterweight (1), tips of forks must not protrude past front of counterweight (l). Possible damage to vehicle engine from forks may result. Weight of counterweight (1) is 3600 lbs. (1636  kg). Use a forklift of at least 4000 lbs. capacity for lifting the counterweight. 1. SECURE COUNTERWEIGHT (1) TO LIFTING FORKLIFT. a. Position forklift forks in pockets (2)  of  counterweight  (1). b. Use a chain or cable to fasten counterweight top mount pin holes to  forklift. 2. POSITION THE COUNTERWEIGHT (1) ON VEHICLE. CAUTION Make sure the counterweight bottom mount pockets fully engage around vehicle frame mounting pins (5) at the rear of the  vehicle. a. Carefully lift the counterweight (1) and move it to rear of vehicle to which counterweight is to be attached. b. Align the counterweight (1) with the  vehicle  frame. c. Raise the counterweight until the pin holes in counterweight top mounts are approximately 3 inches (7.6 cm) above pin holes in vehicle frame  top  mounts. d. Carefully move the counterweight toward the vehicle until the counterweight pockets are directly over vehicle frame mounting pins (5). e. Carefully lower the counterweight (1) until the counterweight pockets engage vehicle frame mounting pins (5) l f. Remove chain or cable securing counterweight to the lifting forklift. 3. INSTALL TWO STRAIGHT PINS (3), AND TWO LOCKPINS (4) TO SECURE COUNTERWEIGHT (1) TO VEHICLE. 4. CAREFULLY LOWER AND REMOVE FORKS OF LIFTING FORKLIFT FROM uNDER COUNTERWEIGHT (1). 5. IF NECESSARY, INSTALL LOAD BACKREST TO STORAGE POSITION, TM10-3930-660-10. 15-3