UPS · VST20N
UPS-32850-WEB-RØ.pdf
- Pages
- 17
- Parts
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Assemblies
Service Procedures
Place dolly under a trailer. Set brakes on trailer and dolly.
Pull the lever into the uncoupling position.
Make sure jaw is locked open and trailer is at
Release Jam Nut (refer to View B-B)
Remove lever (17)
With vehicle at rest in a relaxed condition and landing gear down, (not being pushed together or pulled apart), pull fifth wheel
Install new lever
Make sure the jaw is closed. If not, it can be closed by pushing the trip block (16) forward with a rod or bar. The jaw should be
Test the 5th wheel for proper coupling with a
Remove safety wire if present, on 1283 nut.
This is where the lever is pulled out and held
Using a pair of vise grips, clamp the trip lock rod in front of the guide hole on 5th wheel center casting (16) so as to prevent it from
Pull dolly slowly out from under the trailer.
Remove the 3/8 bolt, 3/8 lock nut and the two 3/8 washers
Tighten bolt until lever is secure against Jaw
Back dolly slowly under trailer until jaw locks kingpin and handle moves to the
When removing the guide bolt (25), applying an anti-seizing compound to the exposed threads often makes the removal process
If the handle will not pull outward when the vehicle is in a relaxed condition, use landing gear to raise trailer and unload the dolly
If the lever won’t stay up, the adjuster nuts on
With the jaw closed or in the coupled position,
Loosen bolt ¼ turn or until assembly moves
Remove the trip block (16) and the trip block spring through the
Remove 1283 nut and 1193 washer or 15315 and 15660
Remove the jaw spring (22) by pulling it through the push rod guide nut.
While holding bolt secure from turning, tighten
Use forklift or eye removal tool (Silver Eagle part no. 15314) to pull against drawbar eye and remove it from the shock housing.
When 5th Wheel functions properly, tighten
Use pliers or another suitable devise to remove old trip block and spring.
Clean any debris from inside of shock absorber bushing and lubricate with rubber lubricant or soapy water
Install the new trip block and / or trip block spring in the throat of the
Pull the fifth wheel lever (19) all the way out.
Lubricate the shock absorber bushing with rubber lubricant or soapy water and install into the shock housing.
Disconnect the fifth wheel lever (19) from the jaw/pushrod assy (18).
Use pliers or another suitable devise to install new trip block and spring.
Remove the jaw/pushrod assy (18) from the 5th wheel table.
Push the trip block (16) as far forward as possible, with a rod or bar
Lubricate the shank of the new drawbar eye with rubber lubricant or soapy water and install into the shock housing.
Lubricate and install the replacement jaw/pushrod assy (18) in the table making sure the pointed tine on the jaw is to aft end of
After the drawbar eye is in place, clean the threads on the shank. VERY IMPORTANT: Coat the threads with Never-SeeZ, pipe
With anti-seize applied to the 3/8 bolt, reinstall the bolt, two washers
There are three methods of pushing it in the final amount:
Install a new washer and thread the nut onto the shank.
Slide jaw/pushrod assy in place without spring. Align hole in jaw with mating hole in lever.
(1) Place the dolly under a trailer or up against a sold wall. Set the brakes on the trailer and dolly. Use a forklift or hostler to push
Apply loctite 242 medium strength thread adhesive or equivalent to cleaned threads of capscrew (23) and jam nut.
Tighten the nut until the rubber shock absorber bushing bulges toward the outer edge of the shock housing at the corners – this is
Install the safety/ground wire through one side of the nut and shank. This is accomplished by drilling through one side of the nut
Thread capscrew (23) into jaw/pushrod assy (18) with two washers (20) between the capscrew head & the lever. Torque the jaw
Tighten the jam nut (1/6-1/4) turn – after contacting the jaw while ensuring the capscrew does not turn.
Periodically check the tightness of the nut and adjust as necessary. You should not be able to turn the lunette eye by hand at any
Slide pushrod spring (22) on push rod of the jaw.
While holding lever back far enough so the jaw pushrod protrudes
Remove the vise grips from the trip block rod.
Test the table to ensure the jaw opens and closes properly.
