An Improved Fan Drive Assembly is Now Used on Certain 773G and 775G Off-Highway Trucks {1359} Caterpillar

Quarry Truck

773G (S/N: MWH1-422; JWS1-402; T5S1-126; T5T1-107)

775G (S/N: T5F1-103; RFM1-963; MJS1-608; T5W1-112)

Description Of Change: An improved fan drive assembly is adaptable to the machines listed above. The fan drive assembly has improved internal bearings to withstand the radial load and to improve the fan drive life. The fan drive also has an improved shaft seal to provide better performance in cold ambient temperatures.

Adaptable To:

Illustration 1	g06223995
(1) 513-9272 Fan Drive Gp

New fan drive group (1) is adaptable to the machines within the listed serial numbers, and is effective in production with all the machines after the listed serial numbers.

Use the following procedure to install the fan drive group (1) in the fan drive arrangement.

Rework Procedure

Show/hide table

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.

Show/hide table

Before service work is begun, park the machine on a hard level surface. Block the wheels of the machine so unexpected movement will not occur. Unexpected movement of the machine can cause personal injury or death.

1. Prepare the machine for maintenance.

   Reference: Refer to Operation and Maintenance Manual, "773G and 775G Off-Highway Trucks".

   Show/hide table

   Illustration 2	g06224005
   (A) Fan guard (B) Belt guard

2. Remove and save fan guard (A) and belt guard (B) from the fan drive arrangement.

   Reference: Refer to Fan-Remove and InstallDisassembly and Assembly, KENR8745-00, "773G and 775G Off-Highway Trucks Engine Supplement".

   Reference: Refer to Fan-Remove and InstallDisassembly and Assembly, KENR9955-00, "773G and 775G Off-Highway Trucks Engine Supplement".

   Show/hide table

   Illustration 3	g06244755
   (C) 336-8878 Fan Spider As (D) 333-7319 Fan Pulley (E) Belt

3. Remove fan spider assembly (C) using a suitable lifting device. The weight of fan spider assembly (C) is approximately 32 kg (71 lb). Discard fan spider assembly (C).

4. Remove fan pulley (D) and fan belt (E) as shown in Illustration 3. Retain fan pulley (D), fan belt (E) and hardware from fan spider assembly (C).
   Show/hide table

   Illustration 4	g06222148
   (F) 243-1872 Fan Drive Gp (G) 333-7318 Fan Adapter

5. Remove and discard fan adapter (G). Remove and discard fan drive group (F) using a suitable lifting device. The weight of fan drive group (F) is approximately 39 kg (86 lb).
   Show/hide table

   Illustration 5	g06222150
   (1) 513-9272 Fan Drive Gp

   Show/hide table

   Illustration 6	g06222275
   (2) 5P-2424 Bolt (3) 7X-3391 Hard Washer (4) 8T-8919 Bolt

6. Attach as suitable lifting device to fan drive group (1). The weight of fan drive group (1) is approximately 49 kg (108 lb).

7. Position fan drive group (1). Install two bolts (2) in upper holes, four washers (3), and two bolts (4) in lower holes as shown in Illustration 5 and Illustration 6.
   Show/hide table

   Illustration 7	g06222151
   (D) 333-7319 Fan Pulley (E) Belt (5) 516-3853 Fan Spider As (6) 455-0172 Fan Spacer (7) 8T-6466 Bolt (8) 7X-7729 Washer

8. Install fan pulley (D), fan belt (E) and hardware that were saved in Step 3.

9. Install fan spacer (6) onto the fandrive hub.

10. Attach a suitable lifting device to fan spider assembly (5). The weight of fan spider assembly (5) is approximately 31 kg (67 lb).

11. Position fan spider assembly (5) with fan spacer (6). Install eight bolts (7) and eight washers (8). Refer to Illustration 7.

12. Install fan guard (A) and belt guard (B) onto the machine that were saved in Step 2.