Disassembly and Assembly of the Water Pump on the 3524B Engine{1361} Caterpillar

Off-Highway Truck/Tractor:

797 (S/N: 1AW1-UP; 2CS1-UP; 3TN1-UP)

Introduction

Some modifications have been made to the water pumps that are being installed on 3524B engines. A non-tapered shaft has replaced the tapered shaft. This special instruction provides information on the disassembly and assembly procedure for the water pump on 3524B engines.

Disassembly

Illustration 1	g00906190
Section view of the water pump (1) Shaft (2) Oil seal (3) Bearing housing (4) Bolt (5) Impeller housing (6) Impeller (7) Spring (8) Ceramic seals (9) O-ring seal (10) Bearing locknut (11) Bearing (12) Snap ring

Use the following guidelines for handling the water pump:

• Do not cause radial movement of the pump drive shaft. Never use any tool that will cause radial movement of the shaft.

• Never place the water pump on a surface so the shaft rests on the surface.

• Never handle the water pump by the shaft.

Illustration 2	g00830410

1. Remove 8 bolts (4) that fasten bearing housing (3) to impeller housing (5). Remove bearing housing (3) from impeller housing (5) .

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Illustration 3	g00906708
Typical example

2. Use tool (A) to remove impeller (6) .

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Illustration 4	g00830474

3. Remove spring (7). Remove the spring loaded portion of ceramic seal (8) from shaft (1) .

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Illustration 5	g00830497

4. Remove oil seal (2) from the bearing housing.

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Illustration 6	g00830503

5. Remove snap ring (12) from the bearing housing.

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Illustration 7	g00830522

6. Support the bearing housing with the splined end of shaft (1) in a downward position. Press shaft (1) and bearing (11) from bearing housing (3) .

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Illustration 8	g00906289

7. If the bearing is being replaced, first remove bearing locknut (10). Support the bearing and press shaft (1) from bearing (11) .

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Illustration 9	g00830533

8. Remove the portion of the ceramic seal (8) that is recessed into the bearing housing.

Assembly

Illustration 10	g00906276

Use the following guidelines for handling the water pump:

• Do not cause radial movement of the pump drive shaft. Never use any tool that will cause radial movement of the shaft.

• Never place the water pump on a surface so the shaft rests on the surface.

• Never handle the water pump by the shaft.

Illustration 11	g00830533

1. Use the installation tool (B) and hand pressure to install ceramic seal (8) into the bearing housing. Use water as a lubricant for installing the ceramic seals.

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Illustration 12	g00906348

2. Support the bearing. Press shaft (1) onto bearing (11). Install the bearing locknut (10). Tighten the bearing locknut to 140 ± 27 N·m (103 ± 20 lb ft).

3. Install bearing and shaft assembly into bearing housing (3) .

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Illustration 13	g00830503

4. Install snap ring (12) .

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Illustration 14	g00906474

5. Use the correct driver from Driver Group (C) to install the oil seal (2). Install the oil seal dry. Install the seal within two minutes of the removal of the seal from the shipping sleeve.

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Illustration 15	g00830474

6. Install ceramic seal (8) onto shaft (1). Remove spring (7) from the seal assembly. Use the installation tool (B) and hand pressure to press the seal assembly on the shaft until the seal faces make light contact. Install spring (7) .

7. Support the bearing housing (3) and press impeller (6) onto shaft (1) .

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Illustration 16	g00830410

8. Install bearing housing (3) onto impeller housing (5). Replace O-ring seal (9) if the seal is worn or damaged. Lubricate the O-ring seal with glycerin or an approved equivalent.

9. Install eight bolts (4). Tighten the bolts to a torque of 47 ± 9 N·m (35 ± 7 lb ft).