1. Park vehicle on level surface.
2. Assure that front spring lockouts have been installed.
3. Raise adjustable stair to full extension. Lower A-frame fully.
4. Operate stabilizers to full extension.
5. Enter stair cavity to reach rear axle U-bolt adjustment nuts.
6. Alternately tighten adjustment nuts on each U-bolt until both front and
rear stabilizer pads appear to make firm contact with ground. Verify by
manually pulling out on the lower part of each front stabilizer or by kicking
the foot pad.
NOTE: It will be easier to tighten the nuts on the U-bolts if the stabilizers are
raised and the stairs are fully retracted to put maximum load on the rear springs.
7. Retract stabilizers.
8. Measure height of front stabilizer structure from ground on both sides of
truck.
9. If measurements are unequal, tighten U-bolts on high side until both
sides are even.
10. Continue tightening both U-bolts until the height of the frame has been
reduced by an additional ½" on each side.
11. Again check that both sides have the same measurement from the
ground at front stabilizer structure.
12. Extend stabilizers, and check that they contact the ground hard.
13. Retract stair, and make sure that all stabilizers are still in hard contact.
14. Tighten jam locknuts over rear axle U-bolt adjustment nuts.
4.3 INSTALLING THE HANDRAILS
4.3.1 Stair Handrails
Hand rails are marked to identify left hand and right hand
installation. Failure to install correctly is unsafe.
1. Remove strapping from handrails.
2. Inspect handrails.
a. Make sure the handrail support posts are secure on the handrail.
Tighten the center bolt if required.
CHAPTER 1 GENERAL INFORMATION & OPERATION INSTRUCTIONS SEPTEMBER 30, 2008
4 COMMISSIONING AND DECOMMISSIONING FOR OPERATION AND SHIPPING PAGE 3
Truck Mounted Passenger Stair TMPS-200 Manual No. 307559
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