Black BLK-SY10 Series Service Manual download pdf (Page 85)

SKYJACK, Page 11

SJIII Compact Series

143909

Section 4 - Troubleshooting Information Service and Maintenance

Hydraulic System

4.2-1 All Functions Inoperative

1. Proportional valve 2H-59 defective or is sticking.

Check valve. Replace if defective. -

2. Compensator portion of proportional valve defective or is sticking.

Check valve. Replace if defective. -

3. Pump P1 defective.

Check pump. Replace if defective. -

4.2-2 All Functions Sluggish

1. System relief valve R1 defective or not adjusted properly.

Adjust valve. Replace if defective. -

2. Hydraulic pump P1 worn.

Check pump. Replace if defective. -

4.2-3 Platform Drifts Down

1. Defective lift cylinder gland seal.

Check for hydraulic oil leaking from the gland seal. Rebuild cylinder. Replace if damaged. -

2. Combination of: Defective holding valve 2H-13-1 and either defective lowering valve 2H-13 or relief

valve R2 or manual lowering valve V1. (ANSI/CSA only)

Check valves. Replace if defective. -

Combination of: Defective holding valve 2H-13B-1 and either defective lowering valve 2H-13B or relief

valve R2 or manual lowering valve V1. (CE only)

Check valves. Replace if defective. -

3. Defective o-ring between lift cylinder and holding valve manifold block or loose bolts holding the

manifold.

Check for hydraulic oil leaking from between cylinder and manifold. Tighten bolts on manifold -

or replace o-ring. Replace manifold if damaged.

4.2-4 Platform Lifts Slowly

1. Open or leaking manual lowering valve V1.

Close valve. Replace if defective. -

2. Lift relief valve R2 defective or not adjusted correctly.

Adjust valve. Replace if defective. -

3. Open manual override on holding valve 2H-13-1 (ANSI/CSA) or 2H-13B-1 (CE).

Depress and turn manual override clockwise to close. Replace if defective. -

4. Stuck or defective deceleration valve 2H-13A (ANSI/CSA) or 2H-13C (CE). (3215 only)

Check valve. Replace if defective. -

4.2-5 Platform Does Not Lift

1. Open manual lowering valve V1.

Close valve. Replace if defective. -

2. Hydraulic oil level too low.

Fully lower the platform. Fill hydraulic tank with recommended fluid to appropriate level. -

3. Platform weight excessive.

Reduce platform load to maximum capacity. -

4. Up valve 3H-14 defective or is sticking.

Check valve. Replace if defective. -

5. Plugged deceleration valve 2H-13A (ANSI/CSA) or 2H-13C (CE). (3215 only)

Clear obstruction from valve. Replace if defective. -

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Black BLK-SY10 Series Service Manual Page 85

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