Seat Looseness - Conversion To Floor Mounted Controls Caterpillar

Seat Looseness - Conversion To Floor Mounted Controls

Usage:

WHEEL LOADERS992G (7HR1-UP) WHEEL LOADERS

THIS TIB REPLACES THE DECEMBER 23, 1998 WHEEL LOADER TIB, COMPONENT CODE: 7312, 7321, "SEAT LOOSENESS-CONVERSION TO FLOOR MOUNTED CONTROLS". DESTROY THE DECEMBER 23, 1998 TIB. IT WILL NOT APPEAR IN THE SEMI-ANNUAL INDEX.

Problem:

Reference: Service Manual Module, SENR5893, Disassembly & Assembly, 992G Wheel Loader, Machine Systems; Pages 256-262, "Seat". This module is found in Service Manual, SENR1344, 992G Wheel Loader Volume II, Machine Systems, Electrical Systems, Operator Station, Maintenance.

Reference: Service Manual Module, SENR6615, Systems Operation, Testing & Adjusting, Disassembly & Assembly, Contour Series Seat.

Complaints have been received of seat looseness on 992G Wheel Loaders with seat mounted controls.

Solution:

This can be corrected with floor mounted controls by following the Installation Procedure. Operator feedback on floor mounted controls has been positive, and product changes are planned.

Parts Needed

1 - Right Bracket - See Page 3 (Paint Black)

1 - Left Bracket - See Page 4 (Paint Black)

4 - 6V-7730 Bolts

4 - 7X-0575 Washers

6 - 5K-1928 Spacers

12 - 1D-4704 Carriage Bolts

12 - 2K-4973 Lock Nuts

1 - Lower Fabricated Spacer (New Seat) - See Page 5 (Paint Black)

1 - Lower Plate Spacer (Original Seat) See Page 5 (Paint Black)

NOTE: In order to fabricate the brackets and spacers, use carbon steel with a tensile strength of 207 MPa (30000 psi) that is capable of being bent flat on itself at room temperature without cracking.

Optional Seat Parts

If a new seat and suspension are needed, order the following components:

1 - 125-6224 Seat Group

1 - 149-2404 Seat Suspension

NOTE: The above seat is from a Caterpillar machine which does not use seat mounted controls and is configured without the seat mounted controls bracket. This seat uses the lower fabricated spacer (new seat) above.

If the original seat and suspension are in good condition and can be reused, use the procedure below.

Cut off the mounting arms of the seat mount controls bracket (Aluminum casting between the seat and suspension) flush with the seat to allow installation of the floor mounted brackets. This seat uses the lower plate spacer (original seat) above.

If there are complaints of cushion comfort, a thicker bottom cushion can be used on either the new or original seat. Use:

1 - 128-7388 Seat Cushion

1. Remove the seat. Remove the plastic and controls from the seat.

2. Place the right and left brackets on the floor of the cab over the original seat locations. Align the bottom holes of the bracket to the threaded holes for the seat mounting on the cab floor.

3. Place the appropriate lower plate or fabricated spacer on top of the brackets.

4. Position the seat suspension on the spacer and brackets. Use four 6V-7730 Bolts and four 7X-0575 Washers to mount the components to the cab.

5. Mount the controls to the brackets using twelve 1D-4704 Bolts, twelve 2K-4973 Nuts, and six 5K-1928 Spacers. Mount the bolts from the inside out. The spacers are positioned between the brackets and the controls casting. Install the locknuts.

NOTE: Before completing this modification, perform the adjustments in the following publications.

Reference: Service Magazine; June 29, 1998; Pages 28 & 29; "Contour Series Seat Adjustment Procedure Available to Reduce Side to Side Motion".

Reference: Technical Information Bulletin (TIB); April 22, 1998; "Arm Rests on Certain Machines May be Loose and Missing Parts".

Perform the adjustments in the following publication only if reusing the original seat.

Reference: Service Magazine; June 29, 1998; Page 30-33; "Shimming Procedure Available for Contour Series Seat to Improve Stability".