1 Troubleshooting and Preventive Maintenance of Hydraulic Systems Learning to Read the Signs of Future System Failures Instructed by: Al Smiley & Alan Dellinger Copyright, 2005 GPM Hydraulic Consulting, Inc.
2 Hydraulic Pumps Fixed Displacement Pumps The GPM of the fixed displacement pump can not be varied.
3 Gear Pump
4 Relief Valves and Fixed Displacement Pumps Provides a flow path for the pump volume back to tank Limits the maximum system pressure
5 Relief Valve
6 Setting the Relief Valve in a Fixed Observe the pressure while operating. Displacement Pump Circuit Open allflow controls and isolate any accumulators. Set the relief valve 200 PSI above the maximum operating pressure
7 Setting the Relief Valve in a Fixed Close the Hand Valve. Displacement Pump Circuit Adjust the relief to 1200 PSI. (For this example) Turn the system off, open the hand valve and remove the gauge.
10 Sound Checks Cavitation is the formation and collapse of air cavities in the liquid. A pump that is cavitating will put out a reduced flow until it destroys itself. Cavitation is caused by: Oil viscosity too high Plugged suction filter Electric motor RPM too high
11 Aeration Aeration occurs when outside air enters the suction side of the pump. Aeration is caused by: Air leak in the suction line Bad shaft seal on a fixed displacement pump Fluid level too low Improper Installation: Coupling is not properly aligned Wrong shaft rotation
12 Checking the Fixed Displacement Pump Check the pump housing for heat
13 Check the current draw on the electric drive motor HP = GPM X PSI X If the pump is bypassing and the GPM output is lower, then the drive motor s current draw will also be lower
14 Checking the Fixed Displacement Pump Through the Relief Valve Turn the relief valve CCW and observe the flow Gradually turn the relief CW and observe the flow
16 Variable Displacement Pumps Variable Displacement Pumps are used when the volume requirements change in the system
17 Pressure Compensating Piston Pump
18 Pressure Compensating Piston Pump
19 Pressure Compensating Piston Pump Case Drain Compensator
20 Pump Compensator Spring Spool
21 Case Drain Most Variable Displacement Pumps have an external case drain piped directly back to tank. Normal bypassing is 1-3% of the total pump volume.
22 Pressure Compensating Piston Pump
23 Case Drain Flow Method #1 There are two methods of checking case drain flow: Run the case drain flow into a container of known size and time it
25 Case Drain Flow Method #2 A flow meter may be permanently installed in the case drain line.
26 Case Drain Line Cooler
27 Pressure Compensating Piston Pump
28 Pressure Compensating Pump Example
29 Pressure Compensating Pump Example
30 Pressure Compensating Pump Example
31 Systems With Relief Valves The purposes of a relief valve in a pressure compensating pump system are: Absorb pressure spikes Operate as an extreme safety device The only time the relief valve should open is when the pressure rises above the compensator setting.
33 Adjustment Procedure Observe the system to find the maximum operating pressure Establish a deadhead condition Turn the relief valve fully CCW Turn the compensator fully CW
34 Adjustment Procedure Turn the relief valve CW to 1450 PSI Turn the compensator to 1200 PSI
35 Relief Set Below Compensator If the relief valve is set below the compensator, the pump will act as a fixed displacement pump. Heat will be generated!
36 Calculating Heat & Electrical Power HP = GPM X PSI X = 30 X 1450 X = 25 HP 746 Watts = 1 Horsepower Electrical Power = 746 X 25 = 18,650 Watts
37 Accumulators Hydraulic accumulators are used to store pressurized fluid
38 Bladder Accumulator
39 Piston Accumulator Piston Accumulator
41 Accumulators Accumulators are used for ONE of two purposes depending upon the PRECHARGE Supply additional oil flow to the system at a very fast rate Absorb shock
42 Accumulators Dry Nitrogen is used to precharge the top portion of an accumulator 1% Argon and other gases 21% Oxygen 78% Nitrogen
43 Accumulators NEVER use Oxygen or Compressed Air to precharge an accumulator! Rule of Thumb - Precharge to onehalf of the maximum system pressure
53 Checking the Piston Accumulator 2000 PSI 2000 PSI System pressure should build to the compensator setting whenever actuators are not cycling
54 Checking the Piston Accumulator System pressure should not drop more than PSI when the directional valve opens 1800 PSI
55 Checking the Piston Accumulator Heat should be felt from here to here: Piston Travel
56 Checking the Piston Accumulator 1000 PSI Dropping to a very LOW pressure usually indicates an accumulator problem 100 PSI
57 Overcharged Heat Piston Movement
58 Oil Bypasses Around Piston Overcharged
60 Piston Removal With the pump on, open the #3 bleeder valve on the charging rig Close the #1 isolation valve Open the #2 manual dump valve Remove the charging rig and the top of the accumulator 3 2 1
61 Leak Paths for Nitrogen Undercharged
62 Undercharged Hydraulic pressure drives piston near the top Heat
63 Bladder Accumulator Poppet Valve
67 Bladder Accumulator Poppet Valve
68 Bladder Accumulator Poppet Valve
69 Bladder Accumulator Poppet Valve
70 Checking The Bladder Accumulator Heat should be felt between these two points
71 Checking The Bladder Accumulator If no heat is felt on the bladder accumulator, then one of two things has happened: The precharge is above the maximum system pressure The bladder is ruptured The nitrogen has leaked out of the bladder
72 Accumulator Dump Valves ANY circuit using an accumulator MUST have some method of bleeding the pressure down when the system is turned off Prior to working on the system, you should VERIFY that the pressure is bled down by observing the gauge
73 Manual Dump Valve
75 Solenoid Operated Dump Valve
77 Tolerances In Components Tolerances in hydraulic pumps and valves: 5-8 microns ( ) Tolerances inside servo valves: 3 microns (.0001 )
78 Sources of Contamination New oil leaving the refinery is relatively clean By the time it reaches your mill it meets a micron standard Oil should always be filtered prior to entering the reservoir
79 Built In Contamination When a system is first built and installed, contamination may be in the form of: Metal Chips Dirt Sand Pipe Sealant Burrs Dust Weld Splatter Paint
80 Ingressed Contamination There are four ways contamination can enter the system from the outside: Breather Cap Access Plates Hose and Component Replacement Cylinder Seals
81 Fluid Sampling The biggest problem in hydraulic systems is CONTAMINATION The key to controlling it is through an effective fluid sampling and filter maintenance program Sample Bottle
82 Oil Analysis The size and number of particles taken from 1ml of the sample are measured by a particle counter
83 ISO Cleanliness Code Recommended Servo Level is 14/11 System 1 passes with a level of 13/11 System 2 fails with a level of 16/14
84 Filter Selection Filters are selected by a Beta rating - the ratio of the number of particles upstream of the filter versus the number of particles downstream of a specific size Fluid entering and fluid leaving the filter is measured with a particle counter
85 Beta Rating 2 3m particles in β 3 = 2 1 3m particle out
86 Beta Rating 75 10m particles in β 10 = % Efficient 1 10m particle out Hydraulic systems require a beta rating of 75 to 100
87 Filter Placement There are primarily three locations for filters in the system (other than the suction strainer): Pressure Line Separate Recirculating System Return Line
88 Pressure Line Filter Upstream of ANY Servo Valve
89 Pressure Line Filter Downstream of a Fixed Displacement Pump operating at pressures exceeding 2250 PSI
90 Pressure Line Filter Downstream of a Variable Displacement Pump operating at pressures exceeding 1500 PSI
91 Return Line Filter
92 Separate Recirculating System
93 Leakage Control Problems with leaks: Expensive -at $3.00 a gallon, one leak that drips one drop per second will cost: $3.38 a day $102 a month $1225 a year Unsafe - dangerous conditions Environmentally Hazardous - EPA setting stricter standards and penalties
94 Causes of Leaks The main reason hydraulic systems leak is because of a bad installation Use the proper schedule of pipe Schedule 40 for suction and return lines Schedule 80 or 160 for pressure lines Apply sealant properly
98 Drain Lines Case drain lines should be piped directly back to tank Below Fluid Level
99 Other Causes of Leaks Pressure settings and shock - pressures set too high result in excess force. Absorbed by the system, excess force shows up as leaks Contamination - Cylinder rod seals are not 100% efficient. In unfriendly environments, a protective cover or boot should be used
100 Thank You For Attending! Copyright, 2005 GPM Hydraulic Consulting, Inc.
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