CURTMFG.COM
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PRODUCT SUPPORT: 877.287.8634
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16600-INS-RA
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12/08/2021
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ECN9081
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PAGE 2
Step 3
Measure from the ground to the surface of the truck bed rails.
Subtract the measurement taken in Step 2 from Step 1.
This value will be near the height requirement for the 5th wheel.
16-3/8" -
20-3/8"
2
11
10
12
13
Before you begin
Assembly includes measuring the height requirement for the 5th
wheel head in relation to the trailer ride height at the kingpin box and
skid plate. Ideally, the trailer should ride as near to level as possible.
The 5th wheel is adjustable from 16-3/8" to 20-3/8", from
the truck bed rails to the top of its skid plate. Adjustment is
attained by adjusting the lower coupler assembly up or down,
in relation to the legs, in 2" increments (typical clearance
between the truck bed rails and the trailer should be a
minimum of 5-1/2"). Follow the steps below to measure.
Step 1
With the trailer on a firm and level surface, set chock blocks
in front of and behind the tires. Do not substitute wood blocks,
rocks, etc. for chock blocks. Extend front trailer lifting jacks,
adjust as required to set trailer at or near level.
Step 2
Measure from the ground to under the trailer's kingpin
box skid plate or lube plate, if used. This will be the portion
in contact with the 5th wheel's skid plate once coupled.
ASSEMBLY
CALCULATING HEIGHT
MAIN BODY ASSEMBLY
Before you begin
Once you have determined the height adjustment required for
the 5th wheel, assemble the lower coupler assembly to the base
weldment using the appropriate holes. Occasionally, the trailer's
kingpin pin box will require adjustment to facilitate correct ride height.
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4
5
8
7
1
9
6
Parts List
Item Qty Description
1 1 Base weldment
2 1 Upper weldment
3 1 Lower coupler assembly
4 1 Lube plate
5 2 Hex bolt, 1/2"
6 2 Nylock nut, 1/2"
7 1 Bushing
8 1 Hex head cap screw, M20
9 1 Nylock nut, M20
10 1 Flat washer, M20
11 4 Spacer, 0.094"
12 4 Base rail mounting clip
13 4 Base rail mounting pin, 1/2"
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