Tools Needed:
// Hex Key Wrench (supplied) // Wrench or Socket - 3/8”
// 2 Open-End Wrenches - 1/2” // Wrench or Socket - 7/16”
// Socket - 1/2”
DU-HA Humpstor
Installation Instructions
DU-HA, Inc. // website: www.du-ha.com // phone: 1.866.306.DUHA (3842) // fax: 1.218.998.4013 // 306 Saint Andrews Street South, Fergus Falls, MN 56537
70200
K
B
M
STEP 1 - Attach Handle
Place Handle (B) over holes in Lid Top. Insert two Bolts #10 x 1.5
(M) through Handle (B) and Humpstor (A) Lid. Secure with Flat
Washer - #10 (N) and Lock Nut #10 (O).
STEP 2 - Assemble Bracket
Install Stabilizer Foot
Attach one Stabilizer Foot to the Left (E) and Right (F) Bracket by
threading one Flange Nut - 5/16 (P) onto Stabilizer Foot (K) shaft
and insert through the lower hole of each Bracket (E,F). Thread a
second Flange Nut (P) onto Stabilizer Foot shaft sandwiching the
Bracket in between.
Hint: flanged side of nuts should face Bracket.
Note: finger tighten.
Extended Stabilizer Foot
Some installations require a longer Stabilizer foot (Toyota Tundra
for example). In such cases, prior to installing the stabilizer foot,
attach one Hex bolt - 5/16 x 2 (U) and Coupling Nut - 5/16 (X) to
each Stabilizer Foot (K).
Installation Instructions:
Attach Plates to Brackets
Option I - Topper or Open Bed Mount
Position two Bracket Clamps (G) facing each other allowing one
to overlap the other. Insert a Hex Bolt - 5/16 x 2 (U) with Flat
Washer - 5/16 (V) through the Left (E) / Right (F) Bracket and
Bracket Clamp pair. Thread (loosely) a Flange Nut - 5/16 (P)
onto the Carriage Bolt so the jaws of the Bracket Clamp pair can
sandwich the truck bed rail.
Offset Plate may be needed to not
interfere with the topper mounting
areas.
O
N
F (shown)
E (opposite)
F (shown)
E (opposite)
E (shown)
F (opposite)
P
K
P
U
X
G
P
U
G
2
1
P
FE
P
U
V
V
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