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
©
Contents
Summary of Contents for Mechanism HMB-8
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