Problem

 

Cause

 

Remedy

Slow cylinder shaft

1.

Gear sections damaged.

1.See authorized service dealer.

speed while extending

2.

Excessive pump inlet vacuum.

2.

Make certain pump inlet hoses are

and retracting.

 

 

 

clear and unblocked-use short,

 

 

 

 

large diameter inlet hoses.

 

3.

Slow engine speed.

3.See authorized service dealer.

 

4.See authorized service dealer.

 

4.

Damaged relief valve.

 

5.Check oil level.

 

5.

Incorrect oil level.

 

6.Drain oil, clean reservoir, and refill.

 

6.

Contaminated oil.

 

7.See authorized service dealer.

 

7.

Directional valve leaking internally.

 

8.See authorized service dealer.

 

8.

Internally damaged cylinder.

 

 

 

Leaking Cylinder

1.

Broken seals.

1.

See authorized service dealer.

 

2.

Scored cylinder.

2.

See authorized service dealer.

 

 

 

 

 

Engine runs but wood

1.

Small gear section damaged.

1.

See authorized service dealer.

will not split or wood

2.

Pump check valve leaking.

2.

See authorized service dealer.

splits too slowly

3.

Excessive pump inlet vacuum.

3.

Make certain pump inlet hoses are

 

 

 

 

clear and unblocked.

 

4.

Incorrect oil level.

4.

Check oil level.

 

 

 

 

5.

Contaminated oil.

5.

Drain oil, clean reservoir, and refill.

 

 

 

 

6.

Directional valve leaking internally.

6.

See authorized service dealer.

 

 

 

 

7.

Overloaded cylinder.

7.

Do not attempt to split wood

 

 

against the grain.

 

8.

Internally damaged cylinder.

 

 

8.

See authorized service dealer.

 

 

 

Engine stalls during

1.

Low horsepower/weak engine.

1.

See authorized service dealer.

splitting

2.

Overloaded cylinder.

2.

Do not attempt to split wood

 

 

 

 

against the grain or see authorized

 

 

 

 

service dealer.

 

 

 

 

 

Engine will not turn or

1.

Engine/pump misalignment.

1.

Correct alignment as necessary.

stalls under low load

2.

Frozen or seized pump.

2.

See authorized service dealer.

conditions

3.

Low horsepower/weak engine.

3.

See authorized service dealer.

 

4.

Hydraulic lines blocked.

4.

Flush and clean hydraulic system.

 

5.

Blocked directional valve.

5.

Flush and clean hydraulic system.

 

 

 

 

 

Leaking pump shaft

1.

Broken drive shaft.

1.

See authorized service dealer.

seal

2.

Engine/pump misalignment.

2.

Correct alignment as necessary.

 

3.

Gear sections damaged.

3.

See authorized service dealer.

 

4.

Poorly positioned shaft seal.

4.

See authorized service dealer.

 

5.

Plugged oil breather.

5.

Make certain reservoir is properly

 

 

 

 

vented.

 

 

 

 

 

 

 

 

 

 

6

Hydraulic

Trouble

Shooting

For repairs beyond the minor adjust- ments listed here, contact an authorized service dealer.

17

Page 17
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Yard-Man 550 Thru 570 manual Retracting, Large diameter inlet hoses, Contaminated oil, Internally damaged cylinder, Vented

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