F.A.Q.s

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Why do I notice a large pressure difference between when the gun trigger is pulled and released?

It’s almost inevitable this will occur after a while. In fact, a good way to catch this early is to follow these steps.
When washing down your bays, take a couple of minutes and run this simple pump check.
With the pump running while in by-pass mode (trigger not pulled) check to see what pressure is registering on the gauge. Have someone then squeeze the trigger, or safely secure the gun and tie the trigger open. Recheck the gauge to read the pressure while it is spraying at full strength. Note the pressure differential between the two readings.
A 50 to 100 PSI pressure increase between off and on would be considered normal and acceptable.
More than that indicates a possible problem, which could get worse and, if left unresolved, possibly cause premature wear on the pump packings and inner components.
Typical causes of this are:
Worn spray tip – Probably the most common and easily rectified solutions is to replace the spray nozzle on a regular basis. Worn tips reduce operating pressure which some operators, when noticing tighten down the regulator. This only increases the problem.

Check valve failure – Any valves which ultimately attach to the high pressure side of the pump may be causing this problem. If they start to get weak, or fail, water may leak by them from the pump. This allows less water to go out to the gun and reduces pressure.

Worn pump seals or damaged parts inside the pump head – When seals get worn and/or metal pieces in the head of the pump are damaged, water is pushed by them and back to the inlet, or even worse, to the crankcase. This also reduces the water going out to the gun and lowers the pressure.

If you notice an erratic reading on the gauge, bouncing or generally unsteady pressure. This often points to a problem with one or more of the pump valves or severely worn pump seals.

How often should I change my oil?

Optimum pump life is achieved by following your pump manufacturer’s service recommendations. Crankcase oil should be changed after the initial 50-hour running period, then every 3 months or 500 hours thereafter.

How Long Should My Bay Hoses Be?

We see this often. Hoses dragging on the floor of the wash bays. This can wear the covering off your hose and expose the braid underneath, causing premature hose failure. It's also not convenient for your customer. To a certain extent, hose length is dependant on boom position. Booms mounted in a central position in the bay are ideal and enables the easiest way to size the hoses. In any case, when the gun(s), and brushes are in their holders, the hose loop should ideally not be touching the floor. Your customer also needs to be able to get all around their vehicle easily without undo hose stretching or hanging up somewhere on the vehicle. Start by walking around a vehicle with the gun or brush and see how easy it is to get around, without allowing the hose to drag on the floor. You can grab the hose a little distance from the gun and pull to artificially shorten it while doing this. Next, measure the distance from where you shortened it to the boom and that will be your length. If the hose is too short, you may need to add several inches to it. The end result should be no hose dragging on the floor and it is not awkward to use the tool.

Why is my pump leaking oil?

To properly diagnose an oil leak, you must first determine the source. Find your source below to determine proper treatment.

Oil Cap – If the source of you leak is out the top of the oil cap, the oil level is too high. Drain oil until level is at center of bubble gauge.

Between crankcase and manifold or around crankshaft ends – If the source is in this area, the oil seals are worn and are in need of replacement. Replacement part numbers can be found on data sheets for your pump.

Back cover on crankcase – If oil is leaking here, replace gasket or O-ring on the cover.


Why is my oil a milky colour?

If the pump is allowed to run after the low-pressure seals and high-pressure seals have become worn, water may eventually travel back along the plunger rod and past the oil seal. Water is a contaminant to the crankcase oil and can cause damage to the drive-end components. The water will cause the oil colour to change to a milky consistency initially and in severe situations can cause damage to the drive-end. Remember to replace the plunger retainer O-ring each time the seals are replaced. For Cat Pumps, the plunger retainer O-rings are supplied in the seal kit for the pump. Check with PELCO for information on other pump brands.

Soap/wax is coming out on the rinse cycle

Most common cause of this is a worn soap/wax solenoid core, or foreign object interfering with the solenoid closing properly. Open solenoid to expose the core and inspect. Replace if necessary.

Coin acceptor has poor/no coin acceptance

Depending on the acceptor manufacturer, you may be able to clean the sensors and reprogram the acceptor. Contact PELCO for further information on your acceptor.

How often should I change my pump oil

Most manufacturers of car wash pumps recommend changing the oil every 3 months or 500 hours. Contact PELCO for information on oil type and frequency for your pump.

When should I drain my air compressor

Air compressor manufactures recommend the compressor be drained daily to prevent water accumulation in the compressor tank. Automatic drain timers may be installed on the tank which will do this several times per day.

My pump has lost pressure

If the loss has been gradual, replace the spray nozzle in the wand. If this does not fix it, the seals may need to be changed. Sudden pressure drop could mean a faulty regulating valve, foreign material in one or more of the valves, or faulty valve(s).

When should I have new seals put in my pump

Seal life varies by pump manufacturer and age of pump. If the pump is leaking, the seals may need to be changed. If the pump is running fine seals may last for two years. Leaving seal changes too long may result in damage to internal components.

Coin Acceptor Problems?

Several things can affect the acceptance frequency of your coin acceptors. Take note of how it is positioned in the meter-box. Is it straight and level? Has the box been damaged and causing the acceptor to flex? Depending on the acceptor, you may be able to open it and wipe the sensors with a clean cloth. Programming itself may be an issue. Since 2001, the Royal Canadian Mint has produced coins using the multilayer plating process. The new plated coins have a special electromagnetic signal for vending machines, which meant that coin acceptors required a software upgrade. Several changes have been made since then and now require the acceptors to be programmed for more than one version of the quarter, loonie, and toonie. Pelco can assist you in programming your acceptors, so they will accept the majority of coins currently in circulation.


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