59
Heavy Haul Trailers
CHAPTER 5
Troubleshooting
To directly assist in keeping your trailer on the road and rolling, the following troubleshooting guide
has been prepared for your convenience. You can avoid serious delay and downtime in servicing your
trailer if the cause of the trouble can be diagnosed and corrected quickly by you.
Problem
Possible Cause
Solution
Coupler Lock does
not fully engage.
Dirt or gravel contamination.
Clean and inspect.
Worn parts.
Check 5th wheel locking adjustment.
Mechanism improperly
adjusted.
Check for excessive wear.
All Air Springs are
flat.
Insufficient air supply.
Build up and maintain tractor air pressure at
least 85 psi.
Check all couplings and valves on tractor
and trailer.
Air spring leaking or
punctured.
Replace air spring.
Leaking or broken line in air
suspension system.
Inspect and test for leaks or pinched air lines.
Repair as required.
Malfunctioning height control
valve.
Inspect, test or replace if necessary.
One Air Spring is
flat.
Air Spring is leaking or
punctured.
Replace air spring.
Supply lines pinched or
broken.
Repair or replace if necessary.
Air suspension
deflates rapidly
when parked.
Leak in the air system.
Locate and repair the leak(s).
Trailer rides too
high or too low.
Improperly adjusted Height
Control Valve.
Check trailer height and readjust Height
Control Valve.
Faulty Valve.
Repair or replace if necessary.
Control Valve linkage broken
or disconnected.
Inspect and repair.
Excessive Shock
Absorber wear.
Defective Height Control
Valve.
Replace valve.
Damaged Air Spring.
Replace Air Spring(s).
Height Control
Valve not
functioning.
Dirt or foreign material in air
supply.
Check and clean air filter. Inspect, clean or
replace Height Control Valve.
Summary of Contents for H550 Series
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Page 4: ...Heavy Haul Trailers ...
Page 15: ...Heavy Haul Trailers 8 ...
Page 30: ...21 Heavy Haul Trailers ...
Page 31: ...Heavy Haul Trailers 22 Both Sides ...
Page 32: ...23 Heavy Haul Trailers Both Sides ...
Page 52: ...43 Heavy Haul Trailers 3 5 4 Extension Load Shim Instructions ...
Page 59: ...Heavy Haul Trailers 50 ...
Page 84: ...69 Heavy Haul Trailers Date Maintenance Performed Maintenance Records ...
Page 85: ...Heavy Haul Trailers 70 Date Maintenance Performed Maintenance Records ...
Page 86: ...71 Heavy Haul Trailers Date Maintenance Performed Maintenance Records ...
Page 87: ...Heavy Haul Trailers 72 Date Maintenance Performed Maintenance Records ...
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