521B and 522B Track Feller Bunchers Machine Systems Caterpillar


Pump Control (Output Flow) - Adjust

Usage:

521B F7B


------ WARNING! ------

Personal injury or death can result from sudden machine movement.

Sudden movement of the machine can cause injury to persons on or near the machine.

To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.

----------------------

------ WARNING! ------

Personal injury or death can result from escaping fluid under pressure.

Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.

Always use a board or cardboard when checking for a leak.

----------------------

Introduction

This information contains the following adjustment procedure:

  • Pump Control (Output Flow) - Adjust

Adjustment Preparation

Use the information in the reference to prepare the machine for this test. Also, use the information in the reference to relieve any system pressure that may be present in the hydraulic system.

ReferenceFor the correct procedure to prepare the machine for this test, refer to Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.

ReferenceFor the correct procedure to relieve any hydraulic oil pressure that may be present in the hydraulic system, refer to Testing and Adjusting, "System Pressure - Release" for the machine that is being serviced.

Adjust the pump output flow if the flow test results differ greatly from the specifications.

Move the machine to level ground.

Lower the work tool to the ground.




Illustration 1g02587947

The switch for the hood

Open the hood for the engine compartment.

Shut off the engine.

Adjustment of the Maximum Output Flow of the Pump




Illustration 2g02748217

Main Pump

(1) Adjustment screw for travel pump. (2) Adjustment screw for implement pump.

Adjust the maximum output flow of the travel pump.

  1. Loosen the locknut.

  1. In order to adjust maximum output flow, turn the screw. Turning screw (1) clockwise will decrease the maximum output flow of the travel pump. Turning screw (1) counterclockwise will increase the maximum output flow of the travel pump.

  1. Tighten the locknut.

  1. Adjust the maximum output flow of the implement pump. Use screw (2) instead of screw (1). Repeat Steps 1 through 3.

ReferenceAfter you adjust the flow of the pump, run the pump flow test. Refer to Testing and Adjusting, "Pump Flow - Test".

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