- Wheel Tractor-Scraper
- 631K (S/N: WT41-101; WT61-101; WTR1-119; WTW1-105)
- 637K (S/N: WTS1-124; WTT1-101; WTX1-101)
Description Of Change: The Inertial Measurement Unit (IMU) sensors used to detect the pitch and yaw of the Wheel Tractor-Scraper are now mounted on an isolation mount. The isolation mount will reduce the acceleration and vibration which the inertial sensors experience during normal machine operation and will improve the performance of the sensor.
Adaptable To: The following changes are adaptable to the products within the listed serial numbers, and are effective with all machines after the listed serial numbers.
New 512-5209 Bracket and 512-5210 Bracket As replaces the former 462-7671 Bracket As in the 475-0292 Grade Sensor and Mounting.
Safety
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Personal injury or death can result from sudden machine movement. Sudden movement of the machine or release of air pressure or oil pressure can cause injury to persons on or near the machine. To help prevent possible injury before testing and adjusting any air system or hydraulic system, perform the procedure in the Testing and Adjusting, "General Information" section. |
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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manuals. Failure to follow the instructions or heed the warnings could result in injury or death. Contact your Cat dealer for replacement manuals. Proper care is your responsibility. |
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Accidental engine starting can cause injury or death to personnel working on the equipment. To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system. Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on. |
Machine Preparation
- Permit only one operator on the machine. Either keep other personnel away from the machine, or keep other personnel in the sight of the operator.
- Move the machine to a safe and secure area. Lower the bowl to the ground.
- Move the transmission control to the PARK Position.
- Engage the parking brakes. Shut off the engine and remove the ignition key.
- Release the hydraulic system pressure. Refer to Operation and Maintenance Manual , "System Pressure Release".
- Place blocks in front of the wheels and behind the wheels.
- Shut off the main battery disconnect switch.
| Required Parts | |||
|---|---|---|---|
| Item | Qty | Part | Description |
| 1 | 6 | Flexible Mount | |
| 2 | 1 | Bracket As | |
| 3 | 2 | Bracket | |
| 4 | 3 | Washer | |
| 5 | 2 | Bolt | |
| 6 | 1 | Clip | |
| 7 | 2 | Clip | |
| 8 | 4 | Cable Strap | |
| 9 | 3 | Cable Strap | |
- Disconnect transmission harness assembly (H) from inertial sensor (Pitch) (C) and inertial sensor (Yaw) (G). Remove and Retain the associated hardware for reuse. Remove and discard cable strap (F) that secures the sensor harness (H).
- Remove bracket (B), inertial sensor (Pitch) (C), inertial sensor (Yaw) (G), and associated hardware from the machine. Save the parts. Discard bracket (B). Refer to Illustration 2.
- Remove and discard clips (D) and cable straps (E). Remove and retain clip (F) and associated hardware for reuse. Refer to Illustration 2.
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Illustration 3 g06230245 (1) 278-7339 Flexible Mount
(2)512-5210 Bracket AsNote: Before assembly, apply blue Loctite 243 to the threads of the mounts.
- Install six flexible mounts (1) into bracket assembly (2). Tighten mounts (1) to
4 ± 1 N·m (35 ± 9 lb in) .Show/hide table
Illustration 4 g06230247 (C) Inertial sensor (Pitch)
(G) Inertial sensor (Yaw)
(2)512-5210 Bracket As
(3)512-5209 Bracket
(4)9X-8256 Washer
(5)5C-9553 Bolt
(6)156-6175 Clip - Mount inertial sensor (Yaw) (G) onto bracket assembly (2) along with bracket (3) using two washers (4), bolt (5), and hardware that was saved in Step 2.
- Mount inertial sensor (pitch) (C) onto bracket assembly (2) along with bracket (3) using clip (6), washer (4), bolt (5), and hardware that was saved in Step 2. Refer to Illustration 4.
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Illustration 5 g06230246 (F) Clip
(2)512-5210 Bracket As
(7)352-3968 Clip - Install two clips (7) and two clips (F) on bracket assembly (2) using hardware that was saved in Step 3.
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Illustration 6 g06230250 (C) Inertial sensor (Pitch)
(F) Clip
(G) Inertial sensor (Yaw)
(H) Transmission harness assembly
(J) Bracket
(2)512-5210 Bracket As
(6)156-6175 Clip
(7)352-3968 Clip
(8)3S-2093 Cable Strap
(9)7K-1181 Cable Strap - Mount bracket assembly (2) onto bracket (J) using hardware that was saved in Step 2.
- Secure inertial sensor harness (Yaw) (G) to the closest clip (F) and clip (7) with two straps (8). Secure inertial sensor harness (Pitch) (C) to clip (6) and clip (7) with two straps (8). Refer to Illustration 6.
- Connect transmission harness assembly (H) to inertial Sensor (Pitch) (C) and inertial Sensor (Yaw) (G). Secure harness (H) with three cable strap (9) using hardware that was saved in Step 1. Refer to Illustration 6.
- Start the machine and check the Inertial measurement unit. The bowl may need to be raised and lowered several times to check the inertial sensor (Yaw) and inertial sensor (Pitch) for proper function. After inspection, return the machine to service.
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| Illustration 1 | g06230252 |
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| Illustration 2 | g06230244 |
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(B) Bracket assembly
(C) Inertial sensor (Pitch) (D) Clip (E) Cable strap (F) Clip (G) Inertial sensor (Yaw) (H) Transmission harness assembly | |
