PTV 35/44/55/66 Installation Manual
Rev. 1.1
21
9.3
Flush the Sill (Sub-Framing)
Steps:
1. Flush the sill: Some trucks or trailers may have configurations with irregular shaped sills,
Fig.4
. The
liftgate mounting surface may NOT be flush with the corner post. Some sills may be inset or have door
gutters. All these situations are remedied with a process called sub-framing and/or flushing the sill.
Sub-framing is done in one of two ways; The sub-frame can be built up using correct siz
e 3/16” or greater
wall tubing before liftgate is mounted. Or, the liftgate can be mounted into position and the sub-frame can
be built as the liftgate is installed with 3/1
6” or greater flat bar.
Fig. 5
. In either case, the liftgate installation
weld procedure does not change.
These examples are show below:
Flushing the floor or filling the gap between the sill and liftgate can span
up to 6” without cross supports.
Use ¼
” thick or greater flat bar or diamond plate to span gap. The original width of the truck frame should
be matched as close as possible.
Bed Level
Corner Stiffener
Light Box
Corner Post
Liftgate Mounting Surface
Liftgate Platform Surface
Gap between Sill and Liftgate
Fig. 4
