Caterpillar Wheel Loader 980K

Drain the hydraulic tank per the manufacturer’s recommendations.

NOTE: This section is only necessary when installing a Hydra Liner Unit. If not pre-heating the hydraulic fluid, skip this section and proceed to section 3.3.

Remove the hydraulic tank from the machine per the manufacturer’s recommendations.;

Route the Webasto power harness (Red and Brown 10 gauge wires) from the heater towards the front of the machine and around the back side of the engine.

Make sure to turn off master disconnect switch before performing this step!

Locate the starter motor on the right side of the engine. Cut the positive lead of the Webasto heater harness to proper length, install supplied eyelet and connect to starter stud as shown in fig. 20.

Route the Webasto heater harness (Brown) ground wire to the engine ground stud as shown. Cut to length, install eyelet and connect to stud as shown in fig. 21.

To enter the cab with the Webasto controller harness; locate existing CAT connector in the back left corner of cab. Use the Deutsch terminals listed in the parts section to pin the 4 controller wires (white, green, black, and red) and insert into the 4 unused sockets of the connector. In this installation, pins 8-11 were empty.

Locate the same connector from the inside of the cab (left rear corner) and pin the remainder of the Webasto controller harness to match the wire colors from the previous step.

Mount the SmarTemp Control fx as shown in fig. 24.

Route controller harness to front right windshield pillar and connect using the pin-out chart below.;

The heater is installed on the left side of the machine to the frame structure using existing mounting points as shown in figures 15-17.

Remove the two existing O.E. bolts and mount large bracket to frame using item 5 of the Optional Add-on Accessories section on page 5. Use one of the previously removed O.E. bolts to affix the small bracket to inner frame shown in fig. 16-17.

A mounting bracket must be fabricated by the installer. Refer to section 6 for mounting bracket example.;

Remove the left side step panel per manufacturer’s recommendations to access the top of the fuel tank.

Thoroughly clean all debris around fuel tank access cover.

Remove for fuel standpipe installation in proceeding steps.

There is an O-ring seal between the access cover and the fuel tank. If the access cover is carefully removed and the seal remains tacked to the cover, it’s possible to reuse the seal. If this O-ring seal becomes damaged or warped in any way it must be replaced.

- Secure fuel tank access cover using a vice or comparable tool.

- Locate the center of the access cover and drill and tap using a 3/8” drill bit and ¼-18 pipe tap.

Make sure the tapered (Pipe) tap is used when tapping this hole as a standard tap will not allow for a fuel tight fit.

Remove Access Door and side panel.

Heater Mounting Location (Left side of machine)

Obtain fuse box access by removing interior panels shown.

IMPORTANT: The CAT 980K Series is designed with a negative (Ground) master disconnect switch. The proceeding steps will describe a necessary Webasto harness ground modification required for this installation.

Remove the heater electrical connector from its current mounting location. This will be relocated in proceeding steps.

Remove ground portion of the harness from the location shown.

Reconfigure all heater harness ground leads into one spliced ground circuit. Harness will no longer be grounded to the heater or machine chassis.

During the heater dry fit mounting process; mark and drill a new hole to mount the electrical connector bracket facing the front of the machine.