Chapter 7: Repair Procedures
Wheel Replacement
Service Manual 7-53
7.11 Wheel Replacement
Refer to “Figure 7-49 Elevating Base with Three-shroud Assembly”.
The wheels may be replaced with the device upright or carefully placed on its back. You may wish to lock
the canopy in its shipping position.
1. Lock all the other wheels.
2. Lift the wheel off the floor and use blocks to support the leg near the wheel you are replacing.
3. Remove the screw, which holds the wheel beneath the leg casting then remove the wheel.
4. Install the replacement wheel then secure the wheel to the leg by tightening the screw through the
wheel plate into the threaded hole in the bottom of the leg.
7.12 Humidifier Assembly Repairs
Refer to “Figure 7-45 Chassis Bottom Cover” and “Figure 7-51 Humidifier Parts”.
7.12.1 Disassembly
1. Remove the humidifier reservoir.
2. Remove the 6 screws that secure the wire raceway cover and remove the cover.
3. Remove the chassis cover. (Refer to “Removing the Chassis Cover with the Storage Drawer in Place” on
page 7-45.)
4. Disconnect the 3 electrical connectors.
5. Remove the 2 screws on either side of the heater assembly.
6. Remove the heater assembly.
7. Use a 2 mm hex key to remove the 2 screws from the reservoir switch and remove the switch.
8. Remove the 4 screws that secure the top bracket. Back the bracket off feeding the wire harnesses
through as you remove it.
9. Remove the top gasket, feeding the wire harnesses through as you remove it. The thermostat wire
harness can slide through the slots in the gasket.
10. Remove the 4 screws in the heater mount and remove the bottom bracket.
11. Remove the socket head cap screw next to the add water thermostat, then remove the bottom gasket,
insulating cylinder, and protective insert.
Qty. per Assy. Description Part Number
3 Screw, M3 X 8, Phillips head, Teflon coated 6600-1255-401
4 Screw, M3 X 10, Phillips head, Teflon coated 6600-1255-402
4 Screw, M3 X 12, Phillips head 6600-1255-403
2 Screw, M3 X 16, Phillips head 6600-1255-404
4 Spacer, .125 ID 6600-1779-500
1 Ramp block 6600-1777-500
1 Heater mount 6600-1291-500
1 Button, reservoir switch 6600-1298-500
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