17.
Check for hydraulic oil leaks.
18.
Replace side panels.
3.4 A-Frame Removal and Installation
3.4.1 A-Frame Removal
1. Remove side panels.
2. Support upper end of stair by placing a pipe (1-1/4" standard pipe is
excellent), or other member of sufficient size and strength, across
underside of top platform so that it protrudes from each side.
3. Suspend two cable slings from a hoist and place one sling around each
pipe end. Assure that slings cannot slip off or shift.
4. Turn hydraulic shutoff valves under truck to "OFF" position. Disconnect
hydraulic lines to A-frame lift cylinder. Plug open lines and ports.
5. Disconnect electrical leads to A-frame unlock relay solenoid and
spotlight.
6. Raise hoist sufficiently to take load off the two upper attach bolts (main
stair to A-frame). Remove upper attach bolts and nuts.
7. Raise hoist enough to provide clearance for removal of A-frame.
8. Clear A-frame of all attached wiring and hydraulic lines.
9. Support upper end of A-frame. Remove the attach bolts and nuts
securing lower end of A-frame to stair support frame.
10.
Using a second hoist, lift A-frame clear of attach lugs and remove from
either side of truck. Move to work area for further breakdown.
11.
Keep upper end of stair supported by first hoist.
12.
Disassemble lift portion of A-frame (reference Chapter 4).
13.
Install in opposite of removal procedures.
14.
When installation is complete, start engine and slowly extend and retract
cylinder to allow air to exit system.
15.
Stop engine and check for hydraulic oil leaks.
3.5 Main Stair Frame Removal and Installation
3.5.1 Main Stair Frame Removal
1. Remove stair assembly.
2. Remove A-frame.
3. Remove bolts, nuts and straps holding main support frame.
4. Make sure all wires, lines, and hoses are clear. Attach suitable hoist
cable slings to frame and lift frame from truck.
CHAPTER 2 MAINTENANCE
SEPTEMBER 30, 2008
3 REMOVAL AND INSTALLATION
PAGE 5
Truck Mounted Passenger Stair TMPS-200
Manual No. 307559
