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Troubleshooting Guide: Rotary Actuators

Rotary Actuators Troubleshooting Guide
PowerTilt® Troubleshooting Guide
PowerGrip® Troubleshooting Guide

Problem Possible Cause Solution
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.

* Replacement parts may be needed.
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