Saw Head Pressure Adjustment for HF201B and HF221A Felling Heads{5051, 5117, 6319} Caterpillar

Track Feller Buncher:

521B (S/N: F7B1-256,258-259)

522B (S/N: F7C1-217,219-221,223-223)

Introduction

This Special Instruction will guide the user thru the required procedure to set the Felling Head pressures. Both the Partial and Full Tilt Head have different wrist pressures. Table 3 provides the pressure settings for the Wrist function.

This action will increase Felling Head performance for the listed machines.

Important Safety Information

Do not perform any procedure in this Special Instruction until you have read this Special Instruction and you understand this information. Use only proper tools and observe all precautions that pertain to the use of those tools. Failure to follow these procedures can result in personal injury. The following procedures should also be observed.

Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs.

A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools in order to perform these functions properly.

Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard.

Therefore, the warnings in this publication and the warnings that are on the product are not all inclusive. Ensure that any tool, procedure, work method, or operating technique you use that is not recommended by Caterpillar is safe.

Ensure that the product will not be damaged or the product will not be made unsafe by the operation, lubrication, maintenance, or repair procedures used.

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Improper operation of an access platform could result in injury or death. Operators must carry out their duties properly and follow all instructions and guidelines given for the machine and access platform.

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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manual. Failure to follow the instructions or heed the warnings could result in injury or death. Contact any Caterpillar dealer for replacement manuals. Proper care is your responsibility.

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Be sure all personnel are clear of the equipment while the equipment is being lowered. Failure to stay clear of the equipment while the equipment is being lowered may result in personal injury.

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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. Prevent possible injury by performing the procedure that follows before working on the machine. Move the machine to a smooth and level location that is away from working machines and personnel. Ground all implements. Engage the parking brake. Stop the engine. Move the hydraulic control levers to all positions to release the pressure in the hydraulic system. To avoid accidental engine starting, turn the battery disconnect switch to the OFF position. Remove the key for the battery disconnect switch. Use a secure padlock in order to lock the battery compartment access door. Place a "Do Not Operate" tag at the Start/Stop switch location to inform personnel that the equipment is being worked on.

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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

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Personal injury can result from hot coolant, steam and alkali. At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns. Remove filler cap slowly to relieve pressure only when engine is stopped and radiator cap is cool enough to touch with your bare hand. Cooling System Conditioner contains alkali. Avoid contact with skin and eyes.

Illustration 1	g00037860

Use steps and handholds whenever you mount the machine. Use steps and handholds whenever you dismount the machine. Before you mount the machine, clean the step and the handholds. Inspect the step and handholds. Make all necessary repairs.

Face the machine whenever you mount the machine and whenever you dismount the machine. Maintain a three-point contact with the step and with handholds.

Note: Three-point contact can be both feet and one hand or a single foot and two hands.

Do not mount a moving machine. Do not dismount a moving machine. Never jump off the machine. Do not try to mount the machine when you carry tools or supplies. Do not try to dismount the machine when you are carrying tools or supplies. Use a hand line to pull equipment onto the platform. Do not use any controls as handholds when you enter the cab or when you exit the cab.

General Preparation

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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manual. Failure to follow the instructions or heed the warnings could result in injury or death. Contact any Caterpillar dealer for replacement manuals. Proper care is your responsibility.

In addition to the normal safety precautions that are taken in the day to day operation of heavy machinery, the following steps are recommended:

1. Move the machine to a suitable location. The location should be smooth, level, and out of direct sunlight.

2. Move away from other working machines and personnel.

3. Ground all implements.

4. Stop the engine.

5. Engage the machine brake. Put blocks in front of the wheels and behind the wheels.

6. Turn the engine start switch key to the ON position but do not start the engine before performing step 7.

7. Move the implement control levers through the full range of travel. This procedure will relieve any pressure that may be present in the implement hydraulic system.

8. Depress the brake pedal repeatedly. This procedure will relieve any pressure that may be present in the brake hydraulic system.

9. Turn the engine start switch key to the OFF position.

10. Allow several minutes for steering system pressure to release.

11. When possible, maintain ownership of the machine keys.

Consult the Machine Operation and Maintenance Manual for all safety procedures applicable to the specific machine being worked on before performing any repairs or diagnostics.

Required Tools

Illustration 2	g03410699

Required Parts

Standard Track Feller Buncher Arrangement

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Illustration 3	g03410702
(B) Pressure Gauge (C) 307-1696 Piston Pump Gp

1. Install the pressure gauge (B) into port M1 of the Piston Pump Gp (C) .

2. Adjust the feed reducer valve as follows:
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   Illustration 4	g03410709
   (1) 168-3443 Relief Valve Gp (D) Cap for the Relief Valve Gp (E) 381-1522 Control Valve Gp (F) Feed reducing adjustment

   1. Start the engine and run at high idle

   2. Cycle the implements while running the machine at high idle. Warm the hydraulic oil to normal operating temperature. (50° ± 5°C (122° ± 9°F))
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   Illustration 5	g03410719
   (1) 168-3443 Relief Valve Gp (E) 381-1522 Control Valve Gp (F) Feed reducing adjustment

   3. Loosen the jam nut on the implement feed reducer. While the operator works the implement, adjust the implement feed reducer (1) to the proper setting. Refer to Table 3. Retighten the jam nut on the feed reducer.

   4. Remove the pressure gauge.

Harvester Arrangement

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Illustration 6	g03410702
(B) Pressure Gauge (C) 307-1696 Piston Pump Gp

1. Install the pressure gauge (B) into port M1 of the Piston Pump Gp (C) .

2. Adjust the feed reducer valve as follows:
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   Illustration 7	g03410709
   (1) 168-3443 Relief Valve Gp (D) Cap for the Relief Valve Gp (E) 381-1522 Control Valve Gp (F) Feed reducing adjustment

   1. Start the engine and run at high idle

   2. Cycle the implements while running the machine at high idle. Warm the hydraulic oil to normal operating temperature. (50° ± 5°C (122° ± 9°F))
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   Illustration 8	g03410719
   (1) 168-3443 Relief Valve Gp (E) 381-1522 Control Valve Gp (F) Feed reducing adjustment

   3. Loosen the jam nut on the implement feed reducer. While the operator works the implement, adjust the implement feed reducer to the proper setting. Refer to Table 3. Retighten the jam nut on the feed reducer.

      Note: The feed reducer will be set all the way in.

   4. Remove the pressure gauge.

Specification Table

Illustration 9	g03413218
(A) Margin Implement Relief (B) Accumulate Close (C) Accumulate Open (D) Swing CCW (E) Swing CW (F) Tilt Right (G) Tilt Left (H) Tilt Back (J) Tilt Forward (K) Boom Up (L) Port B side (M) Port A side (N) Boom (P) Tilt Forward (R) Tilt Side (S) Stick (T) Swing (U) Accumulate (V) Load Sense Implement Relief