1996/12/23 Caterpillar

New Sight Gauge Replaces Former Dip Stick For Improved Visibility Of The Front Implement Hydraulic Tank Oil Level{7479}

Usage:

994 (9YF) Wheel Loaders

Description of Change: A new sight gauge is used to check the hydraulic oil level in the hydraulic tank. This makes checking the hydraulic oil level easier. Formerly a dip stick was used. The sight gauge also helps prevent hydraulic oil from escaping the system if the dip stick is not installed or installed correctly. This change will improve serviceability and the maintenance of the implement hydraulic oil level.

Adaptable To: The 131-6443 Tank Assembly is effective with 994 (9YF116) Wheel Loader. The former tank assembly is adaptable to all earlier machines with the addition of the sight gauge. Refer to the chart for the parts needed and Illustration 1 and Illustration 2 to retrofit the former tank assembly for installation of the sight gauge to the side of the Non-Engine End Frame (NEEF).

Illustratoin 1. Side view of 104-5788 Front Implement Hydraulic Oil Filler Group.

Illustration 2. View of Detail A, Section View A-A and Top View of 104-5788 Front Implement Hydraulic Oil Filler Group.

Assembly And Weld Procedure For 4J-5050 Boss And 9C-7863 Block

1. Drain the front implement hydraulic tank oil into a suitable container.

2. Remove the front cover of the front implement hydraulic tank to access the former dip stick tube assembly.

Illustration 3. View of former dip stick tube assembly (43).

3. Refer to Chart B and Illustration 3 for the procedure to cut former dip stick tube assembly (43) to correct length.

Illustration 4. View B-B bottom of tank assembly.

4. Refer to Chart C and Illustration 4 for the location of the drilled hole and weld position of 4J-5050 Boss (41).

5. Use a 1 19/32 inch magnetic drill to drill a the hole in the bottom of the tank assembly. Weld 4J-5050 Boss to the drilled hole with a 5.0 mm (.20 in) fillet weld.

6. Clean out tank assembly thoroughly before replacing the front cover.

Illustration 5. Rear View of Frame.

7. Refer to Chart D and Illustration 5 for the location of the weld position of 9C-7863 Block (42) on the Non Engine End Frame Assembly (NEEF).

8. Refer to Chart A, Illustration 1 and Illustration 2 to complete the installation of the filler cap, hose assembly, clips, flanges, etc.

9. Refill the hydraulic tank and inspect for leaks.

Caterpillar Information System:

1996/12/23 Ride Control Accumulator Recharging Procedure Changed{5081,5077}

1996/12/23 New Temperature Sensors Used Which Prevent False Over Temperature Warnings{1906,1400}

1996/12/23 Larger Washer Used With Tube Clamps On Hydrostatic Transmission Prevents Clamp From Loosening{3218}

1996/12/23 Externally Adjusted Relief Valve Used In Steering Control Valve Group{4307,4322}

1996/12/23 Cab Heater Efficiency Improved{7304}

1996/12/23 Grapple Rotator Motor Joint Strengthened{5082,6307}

1996/12/23 Rear Axle Oil Level Raised To Improve Axle Lubrication{3013}

1996/12/23 Service Procedures For Special Application Rollers And Idlers Summarized For Track-Type Troctors{4159,4180}

1996/12/23 Longer Bosses Increase Blade Assembly Service Life{5057,6060,6051,6071,7167}

1996/12/16 Improved Fuel Sender Assembly Available {7481}

1996/12/16 Cab Air Conditioner Group Improvements Eliminate Debris {7320}

1996/12/16 Longer Tie Rods For Control Valve Groups {5051,5124}

1996/12/23 New Rotocoil Assembly Used In Engine Cylinder Head Groups{1109}

1996/12/30 Wiring Harness Routing Changed To Increase Wire Harness Service Life {1408}

1996/12/30 Improved Clapper Spring Available For Pilot Valve Groups {5059,5125,5126}

1996/12/30 Supplement To Service Manual Module; "Differential Lock-Relief Valve Pressure Check" {3264}

1996/12/30 Service Brake Adjustment Procedure Improves Application Pressure And Performance {4251,4269}

1996/12/30 Systems Operation Testing & Adjusting, 966F & 966F Series II Wheel Loader Air System And Brakes, Service Manual Module Available {0374,4250}

1996/12/30 New Hose Assemblies Are Compatible With The Extended Life Coolant (ELC) And Provide Increased Service Life {1380,1395}

1996/12/30 New Thumb Screw Improves The Ability To Secure The Air Filter Grate To The Cover Assembly {7301,7308,7251}

1996/12/30 Shaft Nut Torque Reduced To Prevent Actuator Valve Seizure {3200}

1996/12/30 Controlled Tightening Torque Eliminates Bolt Failure {3209,3215}

1996/12/30 Flywheel Housing To Cylinder Block Joint Improvements {1157,1201}

1997/01/13 Nozzle Assemblies Used To Drain And Refill Hydraulic, Engine, And Transmission Oil{5056,5060,1325,0649}