Notice: The cab must be properly supported and the weight of the cab evenly distributed during cab mount replacement. Failure to provide proper support could result in damage to the vehicle.

Ensure to support the cab properly while changing the mount. Tilt the hood and install lifting straps. Refer to Cab Replacement in Body Front End. If changing only one mount, remove the nut on the bottom of the other mount and the nuts beneath the rear support. Removing these nuts will allow the cab to be lifted enough to provide clearance. If lifting straps cannot be used, place jacks under the cab. Position one jack near the mount being replaced. Place another jack under one of the longitudinal sills running from the front to the rear of the cab under the floor. Place a strong block of wood at least 150 mm x 150 mm (6 in x 6 in) between the jack and the cab sill in order to distribute the weight of the cab.

1. From underneath the cab, remove the nut and the washer from both of the front mounts.
2. Remove the nut and the washer from beneath the rear support.
3. Remove the 2 nuts and the washers.
4. Remove the front floor mat.
5. Remove the inner rocker panel plug from the floor at the mount to be replaced.
6. Remove the front cab mounting bolt from the floor.

Raise the cab enough to permit removal of the two cab mount to frame bracket bolts.




7. Remove the 2 bolts and nuts that secure the cab mount assembly to the frame rail bracket.



8. Remove the mount assembly and the retainers from the frame rail bracket on the frame rail.

1. Install the cab mount assembly and the retainers between the cab and the frame bracket.



2. Install the 2 short bolts, the washers, the spacers, and the nuts through the cab mount and the mounting bracket.



3. Install the cab mounting bolt through the plate, the floor, the mount assembly, and the frame bracket.



4. Install the mounting bolt washer and nut to the bottom of the cab mounting bolt.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

5. Lower the cab.

Tighten

•	Tighten the mounting bolt nut to 76 N·m (56 lb ft).

•	Tighten the cab mount assembly to frame bracket bolts to 53 N·m (39 lb ft).

6. Install the inner rocker panel plug to the floor.
7. Install the floor mat.