 |
| Shaft rotates slowly or not at all |
Insufficient torque output |
Verify correct operating pressure. Do not exceed OEM's pressure specifications. Load may be above maximum capacity of the actuator. |
| Low rate of fluid flow |
Inspect ports for obstructions and hydraulic lines for restrictions and leaks. |
| Counterbalance valve has internal leak |
Disconnect hydraulic lines and bypass valve. Leave valve ports open and operate the actuator through housing ports (do not exceed OEM's operating pressure). The valve must be replaced if a steady flow of fluid is seen coming from the valve ports. |
| Leak in piston and/or shaft seal |
Remove the plug and the housing's valve ports. Operate the actuator through the housing ports. Conduct the internal leakage test. |
| Corrosion build-up on the thrust surfaces |
Re-build the actuator. Remove all rust and then polish.* |
| Swollen seals caused by incompatible hydraulic fluid (standard actuators only) |
Re-build the actuator. Use fluid that is compatible with seals and bearings. Contact Helac Corporation for more information. |
| Air in actuator |
Purge air from actuator. |
|
| Operations is erractic or not responsive |
Air in actuator |
Purge air from actuator. |
|
| Shaft will not fully rotate |
Port fittings are obstructing the piston during stroke |
Check thread length of port fittings. Fittings should not reach inside the house bore. |
| Twisted or chipped gear teeth |
Check for gear binding. Actuator may not be able to be re-built and may need to be replaced. Damage could be a result of overload or shock. |
|
| Selected position cannot be maintained |
Counterbalance valve has internal leak |
Disconnect hydraulic lines and bypass valve. Leave valve ports open and operate the actuator through housing ports (do not exceed OEM's operating pressure). The valve must be replaced if a steady flow of fluid is seen coming from the valve ports. |
| Leak in piston and/or shaft seal |
Remove the plug and the housing's valve ports. Operate the actuator through the housing ports. Conduct the internal leakage test. |
| Air in actuator |
Purge air from actuator. |
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