1987/03/02 Caterpillar

New Fan Drives Used{1358}

Usage:

3500 Family Of Engines

SUPPLEMENT: 03/23/87

SERVICE MAGAZINE, MARCH 2, 1987, PAGE 10, "New Fan Drives Used" on the 3500 Family of Engines. Illustrations 1 and 2 appeared in incorrect order. Illustration 1 should show the earlier style fan drive with the remote mounted grease fitting. Illustration 2 should show the newer style grease fitting mounted directly on the fan drive bracket. Additionally Steps 4 and 5 of the fan belt adjustment procedure are not necessary with the newer fan drive.

--------------- END SUPPLEMENT ---------------

Description of Change: New fan drives are used on the 3500 Family of Engines. The new fan drives use a hydraulic cylinder to adjust the belt tension.

Adaptable To: The new fan drives are in effect. There are two versions of these fan drives. The earlier version shown in Illustration 1, uses a remote mounted grease fitting. The later version, shown in Illustration 2, uses a grease fitting mounted in the fan drive bracket.

Illustration 1. Earlier version, 8N6559 Fan Drive Group shown.

Illustration 2. Later version, 7W3952 Fan Drive Group shown.

The procedure to adjust the fan belts is the same for both versions.

1. Loosen the fan drive bracket mounting bolts.

2. Pump grease into the grease fitting until the belts have the correct tension.

3. Tighten the drive bracket mounting bolts.

4. Release the pressure in the cylinder by loosening the grease fitting slowly.

5. After pressure is released, retighten the fitting.

Caterpillar Information System:

1987/03/02 New 8T5261 Bushing Installer And Remover Adapter Tool Available{0600}

1987/03/02 Water Separator Available{1263}

1987/03/02 Check For Plugged Orifices In Mechanical Pressure Gauges{7450}

1987/03/02 Tools Available To Install Plastic Tie Straps{0709,0738}

1987/03/02 Bolt-On Roller Groups Available For Competitive Hydraulic Excavators{4150}

1987/02/23 Water Temperature Regulators Standardized{1355}

1987/02/23 Two Front Timing Gear Housings Available{1162,1150}

1987/02/23 Stronger Timing Gear Housing; Additional Stud Used At Top Of Housing{1151,1201}

1987/02/16 Grommets Added To Dampen Vibration{1307}

1987/02/16 Fuel Ratio Control Diaphragms On 3161 Governors{1278}

1987/02/16 Some 2P4005 Oil Filter Assemblies May Be Difficult To Install{1318}

1987/02/16 Change To Interval For Valve Lash Adjustment{1103,1105,1123}

1987/03/09 Cylinder Head Water Directors No Longer Needed In Direct Injection Engines {1115}

1987/03/09 New Air Cleaner Mounting Brackets Used For Heavy-Duty Air Cleaner Groups {1051}

1987/03/09 Improved Injector Clamp Eliminates Interference With Bridge {1290}

1987/03/16 Modification To Prevent Starter From Remaining Engaged With Flywheel After Engine Starts{1400,1450}

1987/03/16 Improved High Idle Display Of The 6V3100 And 8T5300/8T5301 Engine Timing Indicator Groups{0781}

1987/03/16 New Voltage Regulators Used On SR-4 Generators{4450}

1987/03/16 Remanufactured Cylinder Heads For 3406 Engines{1100}

1987/03/23 Easy Five-Minute Coolant Conditioner Test With 8T5296 Coolant Conditioner Test Kit{1395,0786}

1987/03/23 Cooling System Conditioner{1395,1350}

1987/03/23 5P957 And 5P3514 Coolant And Battery Tester{0786,1395,1401}

1987/03/23 Dispenser Available For Shop Towels{0600}

1987/03/23 Identification Of External Terminals On Alternators{1405,1406,1400}