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Troubleshooting and Testing
Troubleshooting and Testing
EN
5.2.1.2
Electric Power to Dryer
1.
Set the volt-ohmmeter to volts.
2.
Disconnect the vehicle harness at the heater.
3.
Add a small electrical lead at the wire harness connector.
4.
Place leads on each pin of the wiring harness connector.
5.
If there is an abnormal voltage reading, inspect the wiring harness, wires and fuses.
5.2.1.3
Leak Test
1.
Drain air from all system tanks.
2.
Close reservoir draincocks.
3.
Start the vehicle. Allow air system pressure to build while engine idles.
4.
When the system reaches cut-out pressure there will be a purge, or strong blast of air, followed by a mild
flow which will last 10-45 seconds.
5.
Shut off the engine.
6.
Apply a soap solution to each connection that contains pressurized air. Check the connections to see if
soap solution bubbles.
No Soap Bubbles: Connections are sealed correctly.
Soap Bubbles Appear: Connections are NOT sealed correctly.
To Repair Incorrectly Sealed Connections
1.
Drain all reservoirs.
2.
Remove leaking connection.
3.
Inspect the connectors and ports for damaged threads or cracks. Replace if necessary.
4.
Apply pipe sealant to the connection.
5.
Repeat leak test until all connections are sealed.
5.2.2
Air Pressure Checks
When checking air pressure during these tests, do not rely on cab air gauges for accurate readings. Install
a calibrated air gauge, accurate to within one psi (7 kPa), in the air tank to determine if air pressure is within
the required ranges.
5.2.2.1
Operational Test for System Saver Series Air Dryers
1.
Check compressor loaded and unloaded cycle.
When the compressor is in the
loaded cycle
, air pressure will build to approximately 120-140 psi
(827-965 kPa) (cut-out pressure). When the compressor reaches the
unloaded cycle
, the air dryer will
purge, initiating regeneration of the air dryer.
2.
Verify that there is no visible pressure drop in the tanks during regeneration. If there is a visible pressure
drop, perform a check valve leak test on the system check valves.
Summary of Contents for SYSTEM SAVER HP MM1736
Page 1: ...SYSTEM SAVER HP AIR DRYER MAINTENANCE MANUAL MM1736...
Page 2: ......
Page 33: ...33 Notes...
Page 34: ...34 Notes...
Page 35: ...35 Notes...
