Helac L20 Series User Manual

Helical Hydraulic
Rotary Actuators
L20 Series Service & Repair Manual

Helac L20 Series Specifications

General

Brand	Helac
Model	L20 Series
Category	Controller
Language	English

Summary

Tools Required for Service

Spare Parts and Technical Support

Parts List

Disassembly Procedure

Pre-Disassembly Inspection and Preparation

Advises on inspecting the actuator for corrosion and securing it before starting disassembly.

Initial Disassembly Steps

Covers removing port plugs, draining oil, removing cap screws, and drilling lock pins.

Lock Pin and End Cap Removal

Details removing lock pins, installing end cap tools, unthreading, and removing the end cap.

Timing Marks and Shaft Removal

Focuses on identifying timing marks and removing the shaft.

Piston, Seal, and Washer Removal

Covers removing the piston, seals, wear guides, and thrust washers.

Final Seal Extraction

Details removing remaining seals, including O-rings and piston seals.

Inspection After Disassembly

Cleaning and Critical Area Inspection

Assembly Procedure

Preparation and Initial Component Installation

Seal and Wear Guide Installation

Piston and Shaft Integration

Shaft/Piston Alignment and End Cap Prep

End Cap and Lock Pin Securing

Greasing Thrust Washers

Packing Thrust Washer Area with Lithium Grease

Actuator Greasing Procedure

Testing the Actuator

Hydraulic Test Bench Procedure

Outlines testing the actuator on a test bench, including breakaway pressure and cycling at specified pressures.

Internal Leakage Test

Explains how to test for internal leakage by checking oil flow from open ports.

Installation and Bleeding

Post-Installation Safety Checks

Hydraulic System Purging and Bleeding

Troubleshooting Guide

Common Actuator Problems and Solutions

Covers common issues like slow rotation, erratic operation, leaks, and air in the system with their causes and solutions.