SAFETY ALERT SYMBOLS
Safety Symbols alert you to potential personal safety hazards. Obey all safety
messages following these symbols.
WARNING CAUTION
avoid possible avoid possible
injury or death injury and/or property damage
FOR YOUR SAFETY READ ALL INSTRUCTIONS
BEFORE INSTALLATION AND OPERATION
Installer: Provide these instructions to the consumer.
Consumer: Keep documents for future reference.
The Atwood 5th Wheel Pin Box is intended for use on recreation
vehicle 5th wheel-type trailers only.
CAPACITY
AB-72 75690 72° 18,000 lbs. SAE/CSA
AB-34 75700 34° 10,000 lbs. SAE/CSA
AB-34HD 75705 34° 18.000 lbs. SAE/CSA
DO NOT EXCEED THIS CAPACITY
WARNING
TRAILER CAN MOVE OR COLLAPSE
• Know the vehicle weight and all added payload. DO NOT exceed the
gross vehicle weight rating indicated on the pin box.
• Use only with 5th wheel hitches designed for use with SAE 2˝ kingpin.
INSTALLATION
1. Assemble pin box before welding to the trailer frame. Use eight
(four per side) 1/2˝ x 13˝ UNC x 1˝ long, grade 5 bolts with lock nuts
that are supplied and assemble to the desired height. Tighten bolts
to 50-55 ft. lbs. torque.
2. Place 3/8˝ diameter rods through the holes in the sides of the pin
box to provide stops for locating the correct depth in the frame.
3. AB-72 pin box must penetrate trailer frame a minimum of 1-3/4˝.
AB-34 and AB-34HD must penetrate trailer frame a minimum of
1-1/2˝.
4. Pin boxes must be welded full length along trailer frame on both
sides and also across front of pin box to front frame member as
shown. Use 5/16˝ fillet weld No. E601 AWS welding rod 5/16˝
diameter, machine amps (AC or DCRP) @ 160-180 with 50 volts.
5. AB-34HD has a flanged, reinforcing plate on the rear of the pin box.
Weld the flange to the frame, also.
OPERATION
1. See the 5th Wheel hitch manufacturer’s operating instructions for
coupling and uncoupling procedures.
MAINTENANCE
1. Inspect nuts, bolts, king pin, skid plate and bolt holes at least every
2,000 miles of operation for signs of stress or cracking. Torque the
bolts to 50-55 ft. lbs.
2. Skid plate surface may need to be cleaned in order to evaluate
condition. If skid plate or any portion of the pin box connection
shows bending or cracking, replace the pin box immediately.
3. Grease contact surface of pin box with a lithium base grease every
2,000 miles of operation or monthly during use to reduce wear and
provide easier turning.
4. Contact Atwood Mobile Products for warranty information.
CAUTION
PERSONAL INJURY AND/OR PRODUCT DAMAGE
• Do not repair worn or damaged pin box. Pin box must be replaced.
•
Do not make alterations to pin box.
9
LITERATURE NUMBER MPD 71074
5TH WHEEL
PIN BOX
ENGLISH, FRANÇAIS (et Canada)
•Installation •Operation •Maintenance
Effective 11/21/07
Frame Penetration
1-1/2" minimum
Model AB-72
Model AB-34
Bottom View
Frame Penetration
1-3/4" minimum
Model AB-34HD
holes for locating
weld depth
holes for locating
weld depth
Weld here full length
both sides
TRAILER FRAME
TRAILER FRAME
TRAILER FRAME
Weld sides and rear of
horizontal flange
Weld here full length
both sides
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