LEFT BANK ROCKER COVER REMOVAL NECESSARY RAISE CAB 1 1/4 IN.

DUE TO THE CLEARANCE BETWEEN ROCKER COVER AND CAB TOE PAN ON SOME VEHICLES, IT IS NECESSARY TO RAISE THE CAB FOR LEFT BANK ROCKER COVER ACCESS AND REMOVAL. THIS CAN BE ACCOMPLISHED BY REMOVING ONE OR MORE CAB ATTACHMENT BOLTS AND CUSHIONS WHEN RAISING CAB AN ADDITIONAL 1 1/4 INCHES. THE FOLLOWING PROCEDURE PROVIDES THE STEPS REQUIRED TO RAISE CAB ON VEHICLES WITH BOTH ALLIGATOR AND TILT HOODS: 1. APPLY PARKING BRAKE AND PLACE THE TRANSMISSION IN THE NEUTRAL POSITION. 2. REMOVE VEHICLE FLOOR MAT FROM LEFT AND RIGHT FRONT COVERS OF CAB TO UNCOVER BOLTS. SEE FIGURE 1. 3. REFER TO FIGURE 2 AND REMOVE LEFT CAB ATTACHMENT BOLT AND LOWER CUSHION. 4. LOOSEN RIGHT FRONT CAB ATTACHMENT BOLT NUT APPROXIMATELY 1/4 INCHES. 5. VEHICLES WITH ALLIGATOR HOODS REQUIRE REMOVAL OF THE TWO REAR CAB ATTACHMENT BOLTS. THESE BOLTS ARE LOCATED INSIDE OF FRAME RAILS AND DIRECTLY BELOW REAR CAB SILL. SEE FIGURE 1. 6. PLACE A 4X4 INCH BLOCK APPROXIMATELY 26 INCHES LONG UNDER ONE OF THE CAB'S TWO STRUCTUAL CROSS MEMEBERS AS ILLUSTRATED WITH ARROWS IN FIGURE 2. 7. USING A HYDRAULIC JACK UNDER THE 26 INCH LONG BLOCK, RAISE THE CAB AND REMOVE THE CENTER CUSHION BETWEEN CAB'S STRUCTUAL MEMBER AND FRAME RAIL SUPPORT BRACKET. CAUTION: THE ENGINE SHOULD NOT BE OPERATED WHEN THE CAB IS RAISED TO PREVENT PERSONAL INJURY. 8. RAISE THE CAB UNTIL A 2 INCH THICK BLOCK CAN BE INSTALLED BETWEEN STRUCTUAL CROSS MEMBER AND FRAME RAIL SUPPORT BRACKET. NOTICE: THE CAB MUST NOT BE RAISED MORE THAN 1 1/4 ADDITIONAL INCHES AS IT WILL CAUSE STRUCTUAL DAMAGE. 9. INSTALL THE 2 INCH THICK BLOCK AND LOWER CAB. CAUTION: A BLOCK MUST ALWAYS BE PLACED BETWEEN CROSS MEMBER AND SUPPORT BRACKET TO PREVENT PERSONAL INJURY DURING ENGINE REPAIRS. 10. WHEN ALL NECESSARY ENGINE REPAIRS HAVE BEEN COMPLETED, REVERSE PROCEDURES PREVIOUSLY PERFORMED AND INSTALL CAB ATTACHMENT HARDWARE. 11. FRONT CAB ATTACHMENT BOLT NUTS MUST BE TORQUED TO 70-89. LBS. 12. REAR CAB ATTACHMENT BOLTS MUST BE TORQUED TO 52-59 FT. LBS.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.