5. When adjustable section has mated sufficiently with main section,
remove blocks from under upper end of main section and continue
slipping sections together until upper platform level is approximately ten
inches from highest step position on main platform.
6. Connect tread light cable at splice on underside of adjustable section.
7. Align holes in piston of hydraulic cylinder with holes in lugs of attaching
brackets and insert clevis pins and lock pins. Slide sections together until
upper platform level aligns with highest step of main section.
3.3 Stair Cylinder Removal and Replacement
3.3.1 Stair Cylinder Removal
NOTE:
It is not necessary to remove the stair assembly to remove the cylinder.
1. Remove fiberglass side panels to allow clearance for lifting procedure in
step 7.
2. Remove bolts from each side of lower end of main section at handrail
attachment angles. Insert lift pins.
3. Raise hoist to lift weight of stairs from cylinder lower attach point.
4. Relieve hydraulic pressure from cylinder by operating cylinder control
lever.
5. Disconnect hydraulic lines from cylinder.
6. Remove two 3/4-inch bolts and tie-downs attaching stairs to lower end of
main stair frame.
7. Lift rear of stairs 3 to 4 feet. Upper portion will pivot at two attach points.
8. Remove lock pin from clevis pin in lower clevis of cylinder. Support end of
cylinder and remove clevis pin.
9. Remove four bolts and nuts securing cylinder bracket and remove
bracket.
10.
Pull upper stair portion slightly forward if necessary to expose upper
cylinder attach point.
11.
Remove lock pin and clevis pin from upper clevis.
12.
Pull cylinder out through hole exposed by removal of lower cylinder
bracket.
13.
Install the cylinder using the reverse removal instructions.
14.
Start engine.
15.
Hold stair "SAFETY RELEASE" switch on and slowly operate "STAIR
UP/DOWN" control handle to extend and retract cylinder to allow air to
exit system. Lower stair and release "SAFETY RELEASE" switch.
16.
Stop engine.
SEPTEMBER 30, 2008
CHAPTER 2 MAINTENANCE
PAGE 4
3 REMOVAL AND INSTALLATION
Truck Mounted Passenger Stair TMPS-200
Manual No. 307559
