1643725H (404416)
2020-09-28
6
1643725H (404416)
2020-09-28
7
INSTALLATION INSTRUCTIONS
LOCATE HOIST-SUBFRAME ASSEMBLY ON TRUCK
The hoist-subframe assembly is normally mounted to the truck before attaching it to the body.
For Ford trucks, with a 40 gallon rear fuel tank, place the end of the subframe even with the end of the
truck frame, 47 1/2 inches behind the center of the rear axle.
For Ram trucks with a 52 gallon rear fuel tank, and GM trucks with a 40 gallon rear fuel tank, place the
end of the subframe 3 inches ahead of the end of the truck frame.
For trucks where the rear fuel tank does not extend behind the rear spring hanger, and for trucks with fuel
tanks mounted under the cab or outside the frame just behind the cab, mark the truck frame 36 inches be-
hind the center of the rear axle. This should be a minimum of 2 inches behind the rear spring hanger. The
truck frame will be cut off at this mark.
LOCATE BODY/HOIST ASSEMBLY ON TRUCK
Make sure the marks for cutting the truck frame are accurate and even from side to side. Cut off the truck
frame and grind the ends smooth. Place the subframe on the truck making sure it is even with the end of
the truck frame, centered side to side and square with the truck frame. There should be 3 or 3 1/2 inches
clearance between the back of the cab and the front end of the subframe.
NOTE:
If the truck frame has rivets in the top flange, add spacers between the truck frame and subframe,
or counter sink the rivet heads into the subframe by drilling holes in the subframe. Do not remove the rivet
heads!
Fig. 1
MODEL LB520
Cab Clearance 3-5"
30"-36"
CAUTION: BE CAREFUL OF BRAKELINES, WIRING, ETC. INSIDE THE
TRUCK FRAME WHEN DRILLING THE TRUCK FRAME.
Use the following installation procedures when the body and hoist have been assembled at the factory.
Place the body and hoist assembly on the truck frame so there is 3 to 5 inches of cab clearance. Now,
check the location of the back end of the subframe. It should be a minimum of 2 inches behind the rear
spring hanger. The truck frame will need to be cut off even with the back end of the subframe rails, as
shown in Fig. 3.
If the truck is a Ford F450 or F550, the back edge of the rear hinge should be flush with the end of the
truck frame. If the truck is a Ram 4500 or 5500, then the end of the subframe should be 3 inches ahead of
the end of the truck frame.
Block up the back end of the body/hoist assembly and cut the truck frame as marked.
NOTE: If the truck frame has rivets in the top flange, add spacers between the truck frame and subframe,
or counter sink the rivet heads into the subframe by drilling holes in the subframe. Do not remove the rivet
heads!
LOCATE MOUNTING PLATES
There are six mounting plates, three for each side
- one at the front of the subframe, one at the hoist
mount and one between the hoist mount and the
rear hinge. Clamp the mounting plates to the truck
frame and to the subrame as shown in Figures 1
and 2. If desired, locate the plates to use existing
holes in the frame. Mark the mounting plates for
drilling. Repeat this for the other side.
For Dodge trucks, where the subframe is offset
foward from the end of the truck frame, be sure to
locate the rear mounting plate within 2 inches of
the rear hinge.
Drill 21/32” holes in the mounting plates and the truck frame. Bolt the mounting plates in place using 5/8
x 2 cap screws (grade 8) and hex lock nuts, tightening to 180-190 lb-ft.
DRILL TRUCK FRAME
