Contents
1. Introduction 6
1.1 Description 6
2 Hydraulic Elements 6
3 Principles of Operation 7
3.1 CLOSE Operation 7
3.2 OPEN Operation 7
3.3 Over-Pressure Relief Device 7
4 Mechanism Maintenance 7
4.1 Pre-Maintenance Procedures 9
4.1.1 Placing the Mechanism Out of Service 9
4.1.2 Equalizing the Pressure in the Mechanism 9
4.1.3 Manually Operating the Operating Mechanism 9
4.1.4 Slow Switching Operations 9
4.1.5 Deactivating the Close-Position Interlock 9
4.2 General Maintenance Practices 9
4.2.1 Cleanliness 9
4.2.2 Mechanism Seals 9
4.2.3 Hydraulic Oil and Service Life 9
4.2.4 Limits on Pump Motor Operation 10
4.3 General Maintenance Procedures 10
4.3.1 Checking the Hydraulic Oil Level 10
4.3.2 Draining the Hydraulic Oil 10
4.3.3 Replacing the Pump Element (including Check
Valve) and Filter 10
4.3.3.1 Replacing the Pump Element 10
4.3.4 Replacing the Open and Close Pilot Valves 11
4.3.5 Evacuating the Mechanism 11
4.3.6 Refilling the Mechanism with Oil 12
4.3.6.1 Topping Off a Mechanism with Hydraulic Oil 12
4.3.6.2 Refilling a Mechanism that Has Been Drained 12
4.3.7 Replacing the Pump Motor 13
4.3.8 Leak Checking the Hydraulic System 13
4.3.9 Spring Travel Limit Switch Settings 14
4.3.10 Checking the Pump Start Counter 14
5 Manual Operation 14
6 Adjusting the Opening Closing Velocities 15
7 Adjusting the Onboard Auxiliary Switches 15
8 Manually Charging the Operating Mechanism 16
9 Troubleshooting 18
Figures
Figure 1
HMB-8 Hydraulic Operating Mechanism
(cross-cut views) 20
Figure 1b
HMB-8 Hydraulic Operating Mechanism
(external views) 22
Figure 2
HMB-8 Mechanism - High and Low Pressure 24
Figure 3
HMB-8 Position OPEN 25
Figure 4
Mechanical Switch 26
Figure 5
Pump with Motor 27
Figure 6
Measurement of Spring Tension 28
Figure 7
Bottom Side of Working Piston 29
Figure 8
Pilot Valve Assembly 30
Figure 9
Low Pressure Interlock 51016 31
Figure 10
Auxiliary Switch Drive Arm 32
641P026-008
HMB-8 / HMB-11 Mechanism
©
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