1994/01/24 Caterpillar

Removing And Installing Front Suspension Cylinders {7201,7200}

Usage:

D20D (9MG),
D250D (6NG) Articulated Trucks

The front suspension removal and installation procedure given in this article supersedes the information given in Disassembly & Assembly; D20D & D250D Articulated Dump Trucks Machine Systems; SENR8231.

1. Turn the battery disconnect switch OFF and lower the front suspension.

2. Use suitable tooling to support the front axle housing. Remove the exhaust shields if necessary.

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WARNING The suspension system may drop the machine suddenly, leaving no clearance between the axle housing, main frame, tires and mud guards. Working in these areas can result in personal injury or death by crushing. Stay clear until the engine is stopped and the suspension is lowered to the service position.

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WARNING Do not disconnect any hydraulic lines until all the hydraulic pressure has been released from the system.

3. Disconnect the hydraulic line at the top of the suspension cylinder. Put caps or plugs in the line to keep dirt or foreign material out of the system.

Parts Location. (1) 7U-7230 Cylinder Group. (2) 1D-4597 Bolt. (3) 3U-8090 Washer. (4) 4K-0367 Nut. (5) 7U-8363 Pin. (6) 8T4122 Washer.

4. Remove nut (4) and washer (6) from bolt (2) at the top of the suspension cylinder. Remove the bolt (2), washer (3) and pin (5). Place a strap through the upper cylinder bearing and attach a hoist to the strap.

5. Remove nut (4) and washer (6) from bolt (2) at the bottom of the suspension cylinder. Remove the bolt (2), washer (3) and pin (5).

6. Remove the front suspension cylinder. Approximate weight of the front suspension cylinder is 32 Kg (70 lb).

NOTE: The following steps are for the installation of the front suspension cylinder.

7. Put the front suspension cylinder in position and install the bottom pin (5) and washer (3). Install the bolt (2), washer (6) and nut (4).

8. Install the top pin and retaining hardware.

9. Remove the plugs or caps from the hydraulic line. Connect the hydraulic line to the cylinder.

10. Remove the supports from under the machine. Turn the battery disconnect switch ON.

Caterpillar Information System:

1994/01/24 O-Ring Seal Added To Heater Lines Group {1380}

1994/01/24 Adjusting Front Wheel Bearings If The Spindles Are Too Long {4205,4201}

1994/01/24 Heavy Duty Direction Signal Flasher Is Now Used {1430}

1994/01/24 New Flow Control Knobs Available To Improve Disassembly {5137}

1994/01/17 Low Coolant Level Plate In Radiator May Cause False Coolant Level Readings {1353}

1994/01/17 New Valve Cover Gasket Used {1107}

1994/01/17 New Control Assemblies Used In Fuel Injection Control Groups {1298}

1994/01/17 New Flywheel Assembly With Oil Dam Helps Prevent Premature Wear On Internal Splines {1156}

1994/01/17 New Tube Assembly With Bellows At Each End Used In Engine Air Lines Groups {1058}

1994/01/17 9X6779 Radio Has No Memory {7338}

1994/01/17 List Of Entertainment Radios For Earth Moving And Agriculture Equipment {7300}

1994/01/17 Improved 24-12 Volt Converters Available {1400,1421}

1994/01/24 Higher Output Alternator Used {1405,1406,1400}

1994/01/24 Longer Adapter Used To Prevent Hose Chafing In The Steering Lines Group {4304,4300}

1994/01/24 Tail Gate Lines Group Changed To Prevent Hose Contact With Back-up Lamps And Body Hinge Pin {5057,5050}

1994/01/24 New Discs (Thrust Washers), Planet Gears and Spacers Used In Interaxle Differential Group To Improve Service Life {3287,3250}

1994/01/24 Brake Assembly In Drum Drive Motors Has More Discs And Plates {4267}

1994/01/31 High Torque Steering Motor Available {4136}

1994/01/31 Transmission Control Valve Changes On Backhoe Loaders {3150,3152}

1994/01/31 B Series Backhoe Loader May Experience Brake Chatter {3278}

1994/01/31 New Service And Parking Brake Group Is Available {4250,4267}

1994/01/31 New Flywheel Eliminates Hydraulic Force On Crankshaft {1156}

1994/01/31 New Transmission Shift Solenoid Valve Resists Cracking {3174}