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990 II WHEEL LOADER

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  Product: WHEEL LOADER Model: 990 II WHEEL LOADER 4FR Configuration: 990 Series II Wheel Loader 4FR00001-UP (MACHINE) POWERED BY 3412 Engine

Disassembly and Assembly Comfort Series Seat For Caterpillar Machines Media Number -RENR2165-12

Publication Date -01/10/2013

Date Updated -31/10/2013

i01723170

Air Suspension With Air Valve Knob Height Adjustment Assemble SMCS - 7324-016-AJ

Assembly Procedure

Illustration 1

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1. Install compressor assembly (25) to mount (26). Make sure that compressor assembly (25) is seated firmly in mount (26).

Illustration 2

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2. Install bolts (24) in order to attach compressor assembly (25) to scissor assembly (11).

Illustration 3

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Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

3. Install bolt (23) in order to attach spring assembly (18) to scissor assembly (11). Attach hose assembly (22) to spring assembly (18).

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Illustration 4

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4. Install shaft (20) in order to attach toggle assembly (21) to scissor assembly (11). Tighten the two nuts for shaft (20) to a torque of 15 ± 3 N·m (11 ± 2 lb ft).

Illustration 5

g00872031

5. Install shaft assemblies (19) in order to attach tether straps (11A) and scissor assembly (11) to housing assembly (14). Tighten the nuts on shaft assemblies (19) to a torque of 20 ± 5 N·m (15 ± 4 lb ft). Install blocking in order to prevent scissor assembly (11) from falling.

Illustration 6

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Illustration 7

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6. Install screw (17) in order to attach housing assembly (14) to spring assembly (18). 7. Install shaft (15) in order to attach toggle assembly (16) to scissor assembly (11). Tighten the two nuts for shaft (15) to a torque of 15 ± 3 N·m (11 ± 2 lb ft).

Illustration 8

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Illustration 9

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8. Install bearings (12B) to shock absorber (13). 9. Install bolts (12) in order to attach shock absorber (13) to scissor assembly (11) and housing assembly (14). Remove the blocking. Note: Illustration 8 shows the location of lockwasher (12A), bearings (12B), washers (12C), nut (12D), and locknut (12E). 10. Repeat Steps 8 and 9 if the seat is equipped with a shock absorber on the opposite side.

Illustration 10

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11. Connect harness assemblies (9) and hose assembly (10) to air valve (8).

Illustration 11

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12. Position air valve (8) to upper housing assembly (7). Position upper housing assembly (7) to the seat.

Illustration 12

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13. Install cable strap (6) in order to secure harness assemblies (9) to upper housing assembly (7).

Illustration 13

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14. Install shaft assemblies (5). Tighten the nuts for shaft assemblies (5) to a torque of 20 ± 5 N·m (15 ± 4 lb ft). 15. Position plate (4) to the seat. Install lockwasher (3A) and nut (3) in order to secure air valve (8) to the seat. Tighten the setscrew in adjustment knob (1) in order to secure adjustment knob (1) to air valve (8).

Illustration 14

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Mon Nov 4 00:21:49 UTC+0530 2024

Disassembly and Assembly Comfort Series Seat For Caterpillar Machines Media Number -RENR2165-12

Publication Date -01/10/2013

Date Updated -31/10/2013

i01693748

Air Suspension with Air Valve Knob Height Adjustment Disassemble SMCS - 7324-015-AJ

Disassembly Procedure

The air spring of the air suspension is filled with air pressure. Prior to disassembly, release the air pressure in the air spring. Failure to do so could result in personal injury.

Illustration 1

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1. Pull adjustment knob (1) in order to release the air from the seat.

2. Remove boot (2).

Illustration 2

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3. Loosen the setscrew in adjustment knob (1) and remove adjustment knob (1). Remove nut (3) and lockwasher (3A). Remove plate (4) from air valve (8). 4. Remove shaft assemblies (5).

Illustration 3

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5. Remove cable strap (6) in order to disconnect harness assemblies (9) from upper housing assembly (7).

Illustration 4

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6. Lift upper housing assembly (7) and push air valve (8) away from upper housing assembly (7). Remove upper housing assembly (7).

Illustration 5

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7. Disconnect harness assemblies (9) and hose assembly (10) from air valve (8).

Illustration 6

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Illustration 7

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8. Raise scissor assembly (11) and install blocking in order to prevent scissor assembly (11) from falling. 9. Remove bolts (12) in order to remove shock absorber (13) from scissor assembly (11) and housing assembly (14). 10. Remove bearings (12B) from shock absorber (13). Note: Illustration 7 shows the location of lockwasher (12A), bearings (12B), washers (12C), nut (12D), and locknut (12E). 11. Repeat Steps 9 and 10 if the seat is equipped with a shock absorber on the opposite side.

Illustration 8

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Illustration 9

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12. Remove shaft (15) in order to remove toggle assembly (16) from scissor assembly (11). 13. Remove screw (17) in order to disconnect spring assembly (18) from housing assembly (14).

Illustration 10

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14. Remove shaft assemblies (19) in order to remove scissor assembly (11) from housing assembly (14) and tether straps (11A).

Illustration 11

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15. Remove shaft (20) in order to remove toggle assembly (21) from scissor assembly (11).

Illustration 12

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Personal injury can result from being struck by parts propelled by a released spring force. Make sure to wear all necessary protective equipment. Follow the recommended procedure and use all recommended tooling to release the spring force.

16. Remove hose assembly (22) and bolt (23) in order to remove spring assembly (18) from scissor assembly (11).

Illustration 13

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17. Remove bolts (24) in order to remove compressor assembly (25) from scissor assembly (11).

Illustration 14

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Mon Nov 4 00:21:26 UTC+0530 2024

Disassembly and Assembly Comfort Series Seat For Caterpillar Machines Media Number -RENR2165-12

Publication Date -01/10/2013

Date Updated -31/10/2013

i07432502

Air Suspension With System Air - Assemble SMCS - 7324-016-AJ

Assembly Procedure Table 1 Tools Needed Tool

Part Number

Part Description

Qty

Loctite 243

Loctite LB 8632 Silicone Lubricant (1)

Loctite LB 8104 Silicone Lubricant (2)

Loctite LB 8801 Silicone Lubricant (3)

Loctite LB Superlube (4)

(1)

North America

(2)

EAME

(3)

Asia Pacific Division

(4)

South America

1. Check the condition of all parts of the air suspension. If any of the parts are worn or damaged, install new parts.

Illustration 1

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Typical Example

2. Position slider track (31) on upper housing (6). Install bolt (33), two bolts (32) and the washers. Tighten bolts (33) and (32) to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Install locknut (30) and the washer. Tighten locknut (30) to a torque of 40 ± 8 N·m (30 ± 6 lb ft).

Illustration 2

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Illustration 3

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3. Position air spring (28) on scissor assembly (5). Apply Tooling (A) to the threads of bolt (27). Install bolt (27) that holds the air spring to scissor assembly (5). Tighten bolt (27) to a torque of 40 ± 8 N·m (30 ± 6 lb ft).

4. Position tubes (12) and (22) on scissor assembly (5). Install new tie-wraps (29) to secure the tubes to the scissor assembly. 5. Connect tube (22) to fitting (26) on air spring (28). Install two bumpers (25).

Illustration 4

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6. Apply Tooling (B) to scissor assembly (5) at the point of installation for two rollers (24). Install two rollers (24) and two bearings (21). Connect tubes (12) and (22) to valve assembly (23).

Illustration 5

7. Install fitting (11) in lower housing (14).

g00275856

Illustration 6

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Typical Example

8. Install two bearings (17) and (20), damper (18), the pin and locknut (19). Tighten locknut (19) to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Install shaft (7) and cap (15) on damper (18).

Illustration 7

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9. Install scissor assembly (5) into lower housing (14). Install two tether belts (10).

Illustration 8

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10. Install the lower shaft assembly. Install locknut (13) and the lock washer. Tighten locknut (13) to a torque of 40 ± 8 N·m (30 ± 6 lb ft).

Illustration 9

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11. Connect tube (12) to fitting (11).

Illustration 10

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Typical Example

12. Install two tether belts (10) and two bearings (9). Apply Tooling (B) to the scissor assembly at the point of installation for rollers (8). Install rollers (8) on the scissor assembly.

Illustration 11

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13. Apply Tooling (A) to the threads of screw (7). Install screw (7) to secure the air spring, which is not shown. Tighten the screw to a torque of 4.3 ± 1 N·m (38 ± 9 lb in).

Illustration 12

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14. Install upper housing (6) on scissor assembly (5).

Illustration 13

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Typical Example

15. Install the upper shaft assembly, locknut (4), and the lock washer. Tighten the locknut to a torque of 40 ± 8 N·m (30 ± 6 lb ft). Install locknut (4) and the lock washer. Apply Tooling (A) to the setscrew of knob (2). Install knob (2) and the setscrew.

Illustration 14 Typical Example

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Mon Nov 4 00:22:51 UTC+0530 2024

Disassembly and Assembly Comfort Series Seat For Caterpillar Machines Media Number -RENR2165-12

Publication Date -01/10/2013

Date Updated -31/10/2013

i01518481

Air Suspension With System Air - Disassemble SMCS - 7324-015-AJ

Disassembly Procedure 1. Remove the seat from the machine. Separate the seat from the air suspension.

Illustration 1 Typical Example

2. Remove boot (1).

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Illustration 2

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Typical Example

3. Loosen the setscrew on knob (2) and remove the knob. Remove nut (3) and the lock washer. 4. Remove locknut (4) and the lock washer. Remove the upper shaft assembly.

Illustration 3

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5. Tilt upper housing (6) forward. Slide the upper housing off scissor assembly (7).

Illustration 4

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6. Remove screw (7) from the air spring, which is not shown.

Illustration 5

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7. Disconnect two tether belts (10). Remove two bearings (9) and two rollers (9).

Illustration 6

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8. Disconnect tube (12) from fitting (11).

Illustration 7

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9. Remove locknut (13) and the lock washer. Remove the lower shaft assembly.

Illustration 8

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10. Remove two tether belts (10). Lift up scissor assembly (5) and slide the scissor assembly out of lower housing (14).

Illustration 9

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Typical Example

11. Remove cap (15) and shaft (16) from damper (18). Remove locknut (19), the pin, bearings (17) and (20), and damper (18).

Illustration 10

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12. Remove fitting (11) from lower housing (14).

Illustration 11

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13. Remove two bearings (21) and two rollers (24) from scissor assembly (5). Disconnect tubes (22) and (12) from valve assembly (23).

Illustration 12

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Illustration 13

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14. Remove two bumpers (25). Remove bolt (27) from air spring (28). 15. Disconnect tube (22) from fitting (26). Remove air spring (28) from scissor assembly (5). 16. Cut tie-wraps (29) that are holding tubes (22) and (12) to scissor assembly (5).

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