Torque Parts, over 1000 different parts under one brand

Possible Cause

Purge valve is frozen open due to cold temperatures.

Debris, such as particles from the fitting or air inlet line, under the purge valve seat.

Purge valve washer installed upside-down.

Wrong air line connected to dryer port 4 (unloader port).

Purge valve snap ring does not sit fully in the groove.

Solution

Inspect the heater and repair or replace as needed. Make sure the governor‑to‑dryer port 4 line is free of oil and water.

Disassemble and clean the purge valve. Make sure the purge valve is free of water and oil from the top of the piston.

Remove cartridge and clean the dryer sump.

Make sure the lip on the aluminum washer is facing down and away from the dryer.

If necessary, correct the air line installation.

Ensure the snap ring is fully seated in the groove.

Possible Cause

Outlet check valve not seating or regeneration valve not shutting off regeneration airflow.

Solution

Remove and inspect the outlet check valve and regeneration valve diaphragm. Clean if necessary and replace if worn or damaged.

Possible Cause

Outlet check valve not seating.

Regeneration valve not closing off regeneration air flow correctly.

Solution

Inspect and replace outlet check valve if necessary.

Swap regeneration valve.

Possible Cause

During the compressor unloaded cycle, high air system demands.

Pressure-controlled check valve not installed or not working properly.

Wrong (One-way) check valve installed in system reservoir instead of, or with, pressure-controlled check valve.

Faulty Regeneration valve.

Faulty Air governor.

Solution

Air system capacity could be increased or reduce air demands.

Check or replace the pressure-controlled check valve, if necessary.

Remove the one-way check valve and ensure proper installation of pressure-controlled check valve.

Remove the regeneration valve. Ensure that the diaphragm is clean and free of oil and other debris. If no impurities are present, replace regeneration valve assembly.

Inspect and repair or replace as needed, per manufacturer’s instructions.

Possible Cause

Air dryer is not connected to the supply tank or the connections were reversed.

Faulty regeneration valve.

Incorrect (One-way) check valve installed in supply tank.

Alcohol evaporator installed between dryer and supply tank.

Solution

Ensure that the dyer was installed correctly, per the system diagram.

Swap regeneration valve.

Take out the one-way check valve.

Install a bypass line around the evaporator or remove the evaporator from the system.

Possible Cause

Leak in line between governor and dryer port 4.

Leak in line between supply tank and governor.

Air system leaks excessively.

Excessive air system demands.

Outlet check valve not sealing.

Regeneration valve not shutting off properly.

Less than a 16 psi range on air governor.

Air compressor unloader(s) leaking.

Solution

Repair air line.

Repair leaks.

Increase air system capacity or decrease air demand.

Inspect and replace outlet check valve if necessary.

Replace regeneration valve.

Replace air governor.

Inspect compressor. Repair or replace compressor if necessary and per manufacturer’s instructions.

Possible Cause

There is a kink or plug in the air line between governor and air dryer port 4.

Purge valve wedged closed.

Air governor not working properly.

Cut-out pressure never reached by air compressor.

Solution

Repair air line.

Replace purge valve.

Inspect air governor and repair or replace per manufacturer’s instructions.

Check for air leaks and repair if necessary. If there are no leaks in the system, check the compressor output and repair or replace per manufacturer’s instructions.

Possible Cause

Turbo cut-off valve not sealing.

Solution

Replace the turbo cut-off valve.

Possible Cause

Non-1200E dryer installed, but Holset E-Type compressor used.

Compressor not unloading completely when cut-out pressure is reached.

Solution

Replace with a System Saver 1200E air dryer.

Inspect compressor and repair/replace per manufacturer’s instructions.

Possible Cause

Temperature of air coming into the dryer is too high – not enough cooling occurs before dryer inlet.

Solution

Move the dryer farther from the compressor. Add additional compressor discharge line before air dryer. Add cooling or heat exchanger before air dryer. (Note: Inlet air temperature must not exceed 175°F)

Possible Cause

Lip seal installed upside-down on piston (lip must face up towards dryer).

Solution

Install lip seal facing up towards dryer.

Inspect the valve bore for wear. If a new turbo cut-off valve does not seal in a clean, lubricated bore, replace the air dryer.

Possible Cause

Low voltage or no electrical power to heater connector.

Heater assembly now working.

Wrong voltage air dryer used (for example, 12-volt air dryer used in a 24-volt system).

Solution

Check for a blown fuse and repair heater circuit if necessary.

Note: During the entire duration that the vehicle ignition is “on”, there must be power to the heater connector.

Look for signs of low voltage, such as poor electrical ground, bad connections corroded wire splices, etc. and repair.

Replace heater assembly.

Replace with correct voltage air dryer.

Possible Cause

Air dryer not plumbed correctly (connections reversed).

Dryer port 4 connected to wrong air line.

Air governor not working correctly.

Air system leaks, such as compressor discharge line, air dryer, reservoirs, brake or suspension valves, etc.

Air dryer leaks from purge valve.

Solution

Make sure that air dryer port 1 is plumbed to compressor discharge line, and air dryer port 21 is connected to vehicle’s supply tank.

Make sure that dryer port 4 line is connected to the “UNL” port of the air governor.

Inspect governor per manufacturer’s instructions and repair or replace if necessary.

Find the leak(s) and repair.

See purge valve conditions listed in this chart.

Possible Cause

Pressure-controlled check valve not installed in correct tank or not installed at all.

Pressure-controlled check valve installed correctly, but one-way check valve not removed.

Solution

Install pressure-controlled check valve in secondary tank.

Remove one-way check valve so that only the pressure-controlled check valve is installed between the secondary tank and supply tank.

Possible Cause

Desiccant contaminated with oil.

Non-1200E dryer installed, but Holset E-type compressor used.

Solution

Replace desiccant. Inspect the compressor per manufacturers instructions.

Replace air dryer with a System Saver 1200E air dryer.

Possible Cause

Dryer not suitable for application.

Solution

Review application guidelines.

Your favorites empty !!

All Categories

Air Compressors

Air Dryers and Parts

Gladhands and Handle Grips

Height Leveling Control Valves

Valves

Cabin Air Filters

Engine Air Filters

Additional Filters

Air Springs by Vehicle Brand

Air Springs by Category

Body Parts by Truck Brand

Body Parts by Category

Brake Chambers

Service Chambers

Angled Mud Flap Hangers

Straight Mud Flap Hangers

Quarter Fenders

Heavy Duty Shock Absorbers

Light Duty Shock Absorbers

Hub Caps

Truck Wheel Hub Seal Installer Kit

Wheel Bearings

Wheel Seals

Air Dryer Diagnostics

AIR DRYER DIAGNOSTICS

Air Dryer Diagnostics

Air Dryer Diagnostics

Dryer is leaking from purge valve during compressor loaded cycle. Excessive compressor cycling or failure to build air pressure may occur.

Possible Cause

Solution

Slight leak from the purge valve, making the supply tank empty after several hours.

Possible Cause

Solution

Regeneration cycle too long (more than 30 seconds), along with loss of pressure in the supply tank.

Possible Cause

Solution

Too short of a regeneration cycle (less than 10 seconds).

Possible Cause

Solution

No regeneration cycle. After the initial purge blast no airflow (dyer decompression).

Possible Cause

Solution

Air dryer purges too frequently, possibly as often as every 15 seconds, along with excessive cycling of the compressor.

Possible Cause

Solution

Air dryer does not purge when compressor unloads (no blast of air from purge).

Possible Cause

Solution

During entire duration of compressor being unloaded, air flows out of the purge valve.

Possible Cause

Solution

Small amounts of air “spitting” from purge valve rapidly. Frequency varies with engine speed.

Possible Cause

Solution

Air leak at turbo cut-off valve vent. Hole burned in piston.

Possible Cause

Solution

Air leak at turbo cut-off valve vent.

Possible Cause

Solution

Air dryer frozen (water in the base of the dryer is freezing).

Possible Cause

Solution

No air pressure build-up in system.

Possible Cause

Solution

Water in tanks; this usually occurs as a result of aftermarket installation or when dryer is a replacement for a competitive brand.

Possible Cause

Solution

Water, oil or sludge in air system tanks.

Possible Cause

Solution

Water in system tanks, everything else is fine.

Possible Cause

Solution

Do You Have Any Questions?

Location

Quick Links