Direct Lift PP9 Plus - Manual (Page 18)

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• Replacement or rebuilding air and hydraulic cylinders as required.
• Replacement or rebuilding pumps / motors as required.
• Checking of hydraulic cylinder rod and rod end (threads) for deformation or damage.
CAUTION!!
Relocating or changing components may cause problems. Each component in the system must be compatible;
an undersized or restricted line will cause a drop in pressure. All valve, pump, and hose connections should be
sealed and/or capped until just prior to use. Air hoses can be used to clean fittings and other components. How-
ever, the air supply must be filtered and dry to prevent contamination. Most important is cleanliness; Contamina-
tion is the most frequent cause of malfunction or failure of hydraulic equipment.
TROUBLESHOOTING
The common problems that may be encountered and their probable causes are covered in the following para-
graphs:
• Motor Does Not Operate
Failure of the motor to operate is normally caused by one of the following:
1. Breaker or fuse blown.
2. Faulty wiring connections; call electrician.
3. Defective up button; call electrician for service.
• Motor Functions but Lift Will Not Rise
If the motor is functioning, but the lift will not rise do the following in the order given:
1. A piece of trash is under check valve. Push handle down and push the up button at the same time. Hold
for 10-15 seconds. This should flush the system.
2. Check the clearance between the plunger valve of the lowering handle. There should be 1/16” clear
ance.
3. Remove the check valve cover and clean ball and seat.
WARNING!!
Failure to properly relieve pressure in the following step can cause injury to personnel. This lift uses ISO Grade
32 or other good grade non-detergent hydraulic oil at a high hydraulic pressure. Be familiar with its toxicologi-