White Magic PRO 1900, Owner'S Manual

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10. Slipping or worn belts on blower.
11. Defective blower.
12. Worn engine or blower pulley.
13. Seized bearings on blower, pump or engine.
TROUBLESHOOTING GUIDE (continued..)
WATER PRESSURE PROBLEMS
A pumping system cannot put out what it cannot take in. This means that you should assure that the
pump input is adequate and that it is not drawing air. To test the pump it may be necessary to discon-
nect the input and output plumbing and replace it with short pieces of hose connected directly to the
pump. This will determine if the pumping system failure is internal or external to the pumping system.
With the pump operating at normal speed and the CHEMICAL ADJUST valve turned off pump output
should be approximately 4 gallons per minute. If it is less than this refer to the Cat Pump manual. If
the pump output appears normal without pulsations the problem must be external to the pump. Care-
fully analyze the following until the problem is located:
1. Pump operating too slow because belts are slipping. Adjust idler as necessary.
2. Pump clutch is slipping. Visually compare speed of the clutch pulley to the
speed of the center section of the clutch.
3. Assure that the line from the fresh water tank is allowing adequate flow.
Check for blockage or pinched line under console. Inspect disconnect
and water shut off valve.
4. Check unloader valve. Attach a length of hose to the auxiliary valve then
open it. Start the machine and slowly pinch the bypass valve hose. If output
increases rebuild or replace the unloader valve.
5. Check the preheater. A tell-tale sign of a failed preheater is the constant
overflow of coolant from the radiator overflow without the engine running
hot.
6. Check the heat exchanger. Look at the machine exhaust output, check to
see if an unusually large amount of water is being ejected from the pipe.
Condensation will naturally occur in exhaust fumes.
7. Shut off the chemical adjust and observe the auxiliary output.
8. Swap tools and observe water flow. Check valve ball or tool jet may be
clogged.
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