1999/03/01 Caterpillar


New Water Pumps With Improved Resistance To Shock Loads Used{1361}

Usage:


777B (4YC),
777C (4XJ),
777D (3PR, 2YW),
785 (8GB),
785B (6HK),
785C (1HW, 5AZ) 789 (9ZC),
789B (7EK),
789C (2BW),
793 (3SJ),
793B (1HL),
793C (4AR, 4GZ) Off-Highway Trucks;
776B (6JC),
776C (2TK),
776D (5ER),
784B (5RK),
784C (2PZ) Off-Highway Tractors;
854G (1JW) Wheel Tractors;
D11N (74Z, 4HK),
D11R (8ZR, 9TR, 9XR) Tractors;
992G (7HR),
994 (9YF) Wheel Loaders;
5130 (7TJ, 5ZL),
5130B (4CS),
5230 (7LL) Excavators

Description of Change: New water pump groups are used on the 3500 and 3500B Engines in these machines. The new water pump groups include a new ring assembly and new seal group. These new components will provide the water pump assembly with increased resistance to damage from shock loads. These shock loads typically occur during shipping, handling, and installation of the water pump.


Illustration 1.
Location of the new 166-4374 Ring Assembly (1) and 166-4376 Seal Group (2) in typical new water pump group.

Adaptable To: The chart identifies the new and former water pump groups for the 3500 and 3500B Engines in these machines. The new water pump groups are direct replacements for the former water pump groups.

The new 166-4376 Seal Group is a direct replacement for the 124-5245 Seal Group in former water pump groups. The new 166-4374 Ring Assembly is adaptable to former water pump groups if a 2.50 ± 0.05 mm (.098 ± .002 in) diameter hole (X) is drilled through the water pump housing as shown in Illustration 2. This new hole will accept the pin (A) of the new ring assembly (1). See Illustration 3. This will keep the new ring assembly positioned with the opening in the ring toward the bottom of the installed water pump. This will allow any fluid the leaks past the water pump seals to get to the water pump weep port.


Illustration 2.
Dimensions for adding new hole to typical water pump housing. At radius (R) = 17.50 ± 0.25 mm (.689 ± .010 in), drill 2.50 ± 0.05 mm (.098 ± .002 in) diameter hole (X) through the water pump housing.


Illustration 3.
166-4374 Ring Assembly.

Pin (A).

Caterpillar Information System:

1999/03/01 New Flywheel Housing Gasket For 3406 Machine Engines{1157}
1999/03/01 Improved Brake Switch Now Used{4262,1408}
1999/03/01 Supplement To Correct Manual Modulation Pedal Adjustment{3059,3071}
1999/03/01 Special Instruction, REHS0103-01, Available For Procedure For Dynamometer Test For Power Take-Off{3107}
1999/03/01 Fan Pulley/Adapter Changes Summarized{1356,1384,1359}
1999/03/01 Stronger Floatpin Design Available{5102,7120}
1999/02/22 Shielded Metal Arc Welding And Flux Cored Arc Welding Information {0679}
1999/02/22 New Radiator And Oil Cooler Mounting Configuration {1350}
1999/02/22 New Improved Tow Point Roller Design Now Being Used {6600}
1999/02/22 Correction To Service Brake Disc Information {4250,4255,7473}
1999/02/22 PS-360B Tires {4203}
1999/02/22 3116 Engine Oil Capacity {1326}
1999/03/01 New Tie-Down Available For Asphalt Paver{6600,6100,6300}
1999/03/08 Software Improvements {7620}
1999/03/08 Use 155-1557 Gauge For Scraper Adjustment On Cast Steel Drive Wheels {4199,0766}
1999/03/08 New Seal Installers For Mid-Rollers And Idlers {4159,4180}
1999/03/08 Supplement To Add Fill Instructions On All Wheel Drive Pump In D&A Manual {3203}
1999/03/08 Supplement To Add Fill Instructions On All Wheel Drive Pump In OMM Manual {3203}
1999/03/08 New Basic Fuel Transfer Pump Group Includes New Outer Lip Type Seal {1256}
1999/03/08 Use FT2593 Spanner Wrench To Rotate Concentric Pin To Align Pipelayer Frames {7052}
1999/03/08 Improved Exhaust Tubes Now Used On Off-Highway Trucks {1061}
1999/03/08 New Steering Column Bearing Kit Available For Off-Highway Trucks {4310}
1999/03/08 New Muffler Reduces Cab Noise {1062}
1999/03/08 Use 151-7537 Adapter Bracket Assembly And 150-3978 Lifting Bracket Assembly As Pod Removal And Installation Tool {6605}
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