J&M Roll Tarp GRAVITY BOX (Since 2011) - Manual (Page 9)

STEP 4 - ENDCAPS
8
STEP 5 - ENDCAPS CONTINUED
STEP 6 - SPRING RETURN
5.1 Use the four holes on the top of the front Endcap
as a guide to drill four holes from the top using a 1/4”
drill bit.
5.2 Insert 1/4” x 3/4” bolts and fasten with 1/4” ser-
rated flange nuts.
5.3 Repeat Steps 5.1 & 5.2 for the back Endcap.
NOTE: This step is only pertains to 440/540 & 680/760 Models
Install the Spring Return on the front of the gravity
box using ten 1/4” x 3/4” self tapping bolts. Be sure
the end with the cable loop is OCS. It should be
positioned up against the OCS corner brace. See the
chart below for model specific Spring Returm loca-
tions.
Model Spring Return Location
440 Above ladder - straddling Ripple
680 Below ladder - straddling Ripple
540 & 760 Above ladder - straddling Shell/
Sideboard Seam (as shown on left)
STEP 7 - KNEE BRACES
7.1 Mark the hole for the Knee Brace as centered
as possible using the Knee Brace as a guide. When
marking the hole push up on the Endcap to keep it
from sagging.
7.2 Drill the hole using a 3/8” bit.
7.3 Use a 3/8” x 1” serrated flange bolt and a 3/8”
serrated flange nut to fasten the knee brace. Be sure
that the knee breace applies upward pressure to the
Endcap.
7.4 Repeat Steps 7.1-7.3 for the remaining knee
brace under the opposite Endcap.