Cat Pumps also offers manifolds made of a washout resistant material. Repair and clean as indicated or replace internal piston. Home Pressure Washer Center Troubleshooting Running Rough. If returning the by-pass back to the pump inlet, install a Thermo Valve in the by-pass line. If there is corrosion or debris inside this check valve, the pump may experience turbulent inlet conditions. This pump is made with concentric solid ceramic plungers which means they will remain cooler and last much longer. Never run a pump dry. If installed backwards, they will not hold a seal. Worn nozzle(s) are the most frequent cause of low pressure. Follow service and preventive maintenance recommendations. Carefully examine the outer surface of the sleeves at the end of the piston rod each time the seals are replaced. If this occurs at start up, the belts require adjustment. In this condition, a damaged plunger could allow water or the fluid pumped to seep and even pass-through seals, resulting in a leak. Add accessories such as a thermal valve or throttle controller to protect pump while it is in by-pass mode. A pulsation dampener is commonly referred to as an “accumulator.”  Dampeners may be charged with a gas (such as nitrogen) or spring-loaded. Proper line size and adequate liquid to the pump are critical. CAT Pumps Pressure Washer Pump - 4000 PSI, 4.0 GPM, Direct Drive, Gas, Model Number 66DX40GG1. Their pumps are used across many industries from breweries, cement plants and oil fields to pulp and paper and pressure washers. 561-964-3228 sales@jnequipment.com. Make certain the line size is at least the size of the pump inlet [preferably one size larger] and elbows are kept to a minimum. Debris and contamination build-up on valve seat surfaces can disrupt the normal flow through the inlet and discharge valves. to stabilize the inlet pressure. If the situation gets too severe, the valves will also show pitting. In the piston pumps the sleeve and cylinder surfaces should be examined with each seal and cup replacement. Use PTFE liquid or tape on all connections. The seal retainer pushes against the backside of the low pressure seal, keeping it perpendicular to the plunger/piston rod. Plungers are sold separately. Review entire inlet section for any potential sources of restriction or air leaks: We also have our Cavitation Whiteboard Sessions videos explaining the causes, and effects of cavitation below: Loud sucking noises typically indicate the pump is under stressful inlet supply. Inj. No reading indicates the gauges is probably damaged and needs to be replaced. Always make sure water is getting to the pump before starting the engine. Then drain the crankcase, clean the drive end, and fill with new Cat Pumps oil. 99 $. OR ORDER ONLINE – CLICK THE Link CAT PUMPS Below are the Data Sheets (DA) and Service Manuals (SM) for all active CAT PUMPS. Many systems will have a check valve on the inlet supply line feeding  the pump. Flexible hose at the pump inlet and prior to any hard plumbing in the discharge line is recommended. CHANGE OIL IMMEDIATELY IF CONTAMINATED. Running the pump without washing or spraying water can put the pump into “by-pass mode.” When the pump is in by-pass mode and water is directed back to the pump inlet, excessive heat can quickly build. Also, verify filter sizing. Hand torque to specifications in torque chart. PWP P/N: CAT-31422. In some systems, a pressure diagnostics sensing port can be used to verify system pressure. If returning a high volume of warm liquid to the holding tank, oversize the tank to allow for adequate cooling before going back to the pump. The unit is widely compatible as it fits 7/8-inches shaft crank pressure washer, brands, and more. Pump: 4PPX30GSI. Oil level should never fall below the red dot of the sight gauge. Gauges can fail due to over-pressurization or pressure spikes. Remove each valve or set of valves and inspect for wear or debris. Often, pressure-related problems are not due to the pump, but due to downstream components. Proper lubrication is critical to assure long pump life. $. Entrapped air creates bubbles that may implode under pressure, causing caviatation and often loud pump “grinding” noises. (Inlet Pressure Stabilizer). Replace seals and do not run in by-pass mode for longer than 3 to 5 minutes. Shop 13 CAT Pumps Pressure Washers products at Northern Tool + Equipment. If conditions are extreme, a properly vented enclosure is recommended. It will give a low pressure or fluctuating pressure reading on the gauge and result in damage to the pump. Operating with a scored plunger rod can cause wear to the crankcase oil seal and ultimately a mixing of oil/water. Sometimes this excessive pressure will crack or warp the manifold. Typically crankshaft oil seals should be replaced with a bearing replacement or if the oil becomes contaminated. Request a Free Catalog ... Cat Pumps Pressure Washer Pump — 1500 PSI, 2.0 GPM, Direct Drive, Electric, Model# 2SFX20 Only $ 479. If the shipping plug is not removed, there is a small chance that pressure can build in the pump crankcase during operation and push oil past the oil seals. Check the pH of the liquid to be certain it falls within the 5 to 9 range. Sometimes pressure washers can break down due to improper operation and you will have to ask for help to the master for repair. 3000 PSI. 3/4" Hollow-Shafted Pump. Exceeding the rated pump inlet pressure can result in premature wear of the low pressure seals, resulting in external leaks. Disassemble the unloader to inspect. Inspect inlet line for loose fittings, cracked filters, fittings that need to be re-taped or any other restrictions in the inlet line. Enlarge supply tank to accommodate high by-pass and allow liquid to cool before returning to the pump. A clogged inlet filter can be a serious issue for your system. See the attached chart for more information. An adequate and smooth (non-turbulent) water supply to the pump is essential for best performance. Replace the Cylinders or sleeves as needed. Tighten or replace belts as required. A good rule-of-thumb is to match the inlet port size of the pump; do not reduce the filter port size. An inlet filter removes contamination, preventing it from entering the pump. Initially pressure may drop, but ultimately serious damage will result due to lack of liquid to the pump. See below document for proper nozzle selection. All Cat Pumps oil caps are vented to atmosphere. This can be caused by a restriction of the fluid flowing in to the pump, or an air leak on the inlet lines of the pump system. Operation in excessively humid conditions or with direct spray onto the pump may also affect the crankcase oil. 3400 RPM. Pumps have a maximum operating temperature to protect seals and O-rings from heat damage. Reduced inlet flow results in reduced flow to the system, which works to reduce system pressure as there is less resistance to the lower flow being produced. Lower flow means resistance to the flow decreases, which translates into lower system pressure. We believe in producing only the highest quality and longest-lasting pump available. Check liquid supply for contamination. Cat Pump 4DNX27GSI Replacement power washer pump first most 4 to 7hp engines with a 3/4" inch horizontal shaft. The pump supply line from the tank should be plumbed from the opposite side of the tank than the by-pass return and tank fill line. This CAT Pumps Pressure Washer Plunger Pump Repair Video shows the repair of the Fluid end of the CAT Pumps – Plunger Pumps from 3 – 68 and the 2SF and 4SF CAT Pumps. Make certain liquid temperature is within pump range. A pump uses the incoming water to lubricate and cool its internal components and requires an adequate supply of water to fill the chambers. On many pumps there is a shipping plug installed on the top of the red cap to prevent oil from spilling during shipping. Ensure oil level is correct before using. Inspect the seal retainers and replace as required. Click on your pump model for information Need help ? But you can try to repair the fault within a short period your own resources with the help of the troubleshooting. Scored Cylinders generally occur when the cups wear and the pump continues to operate. Cart; CAT Pumps. Filling the crankcase to the RED DOT on the bubble gauge will assure that adequate lubrication is delivered to the crosshead area of the plunger rods. 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