Several elements make up a complete, functioning pumping system. All of these elements need to be operating correctly in order for the whole system to
function. Some of the elements include: duty-cycle, liquid being pumped, operating conditions and specifications versus the ratings and capabilities of the
pump and accessories. Proper care and maintenance of pump and system components will maximize the life of your equipment. Review and follow
recommendations regarding system design and inlet conditions to avoid potential problems.
Arimitsu Pumps are designed to offer superior life and be easy to service. Field servicing can be accomplished with standard tools. Use the following table as a
guide to determine cause and remedy for possible problems. Contact Arimitsu Pumps directly via web site or telephone for further assistance.
PROBLEM PROBABLE CAUSE SOLUTION
Low pressure • Worn nozzle. • Replace with properly sized nozzle.
• Belt slippage. • Tighten belt(s) or install new belt(s).
• Air leak in inlet plumbing. • Tighten fittings and hoses. Use PTFE liquid or tape.
• Pressure gauge inoperative or not registering accurately. • Check with new gauge. Replace worn or damaged gauge.
• Relief valve stuck, partially plugged or improperly adjusted. • Clean/adjust relief valve. Replace worn seats/valves and o-rings.
• Inlet suction strainer (filter) clogged or improperly sized. • Clean filter. Use adequate size filter. Check more frequently.
• Abrasives in pumped liquid. • Install proper filter.
• Leaky discharge hose or spray gun. • Replace discharge hose with proper rating for system.
• Inadequate liquid supply. • Check & clean filters.
• Severe cavitation. • Check inlet conditions.
• Worn Seals. • Install new seal kit. Increase frequency of service.
• Worn or dirty inlet/discharge valves. • Clean inlet/discharge valves or install new valve kit.
Pulsation • Faulty Pulsation Dampener. • Check precharge. If low, recharge, or install new dampener or pulse hose.
• Foreign material trapped in inlet/discharge valves. • Clean inlet/discharge valves or install new valve kit.
Water leak
•Under the manifold • Worn V-Packings, Hi-Pressure or Lo-Pressure Seals. • Install new seal kit. Increase frequency of service.
•Into the crankcase • Humid air condensing into water inside the crankcase. • Change oil every 3 months or 500 hours.
• Excessive wear to seals and V-Packings. • Install new seal kit. Increase frequency of service. Check inlet &
water conditions
Knocking noise
•Inlet supply • Inadequate inlet liquid supply. • Check liquid supply. Increase line size, pressurize, or dual feed.
•Pulley • Loose pulley on crankshaft • Check key and tighten set screw.
Recommended Oil Service Intervals: After first 30 hours, every 500 hours thereafter.
Oil leak
•Crankcase oil seals • Worn crankcase oil seals. • Replace crankcase oil seals.
•Crankshaft oil seals and o-rings • Worn crankshaft oil seals or o-rings on bearing cover. • Remove bearing cover and replace o-rings and/or oil seals.
•Drain plug • Loose drain plug or worn drain plug o-ring. • Tighten drain plug or replace o-ring.
•Rear cover • Loose rear cover or worn rear cover gasket. • Tighten rear cover or replace gasket.
•Filler cap • Excessive oil in crankcase. • Fill crankcase to specified capacity, do not overfill.
Pump runs extremely rough
•Inlet conditions • Restricted inlet or air entering the inlet plumbing. • Correct inlet size plumbing. Check for loose connections. Clean filters.
•Pump valves • Stuck inlet/discharge valves. • Clean out foreign material or install new valve kit.
•Pump seals • Leaking V-Packings, Hi-Pressure or Lo-Pressure seals. • Install new seal kit. Increase frequency of service.
Premature seal failure • Scored plungers. • Replace plungers, check inlet conditions.
• Over pressure to inlet manifold. • Reduce inlet pressure per specifications.
• Abrasive material in the liquid being pumped. • Install proper filtration at pump inlet and clean regularly.
• Excessive pressure and/or temperature of pumped liquid. • Check pressure and inlet liquid temperature.
• Running pump dry. • DO NOT RUN PUMP WITHOUT LIQUID.
• Starving pump of adequate liquid. • Increase hose one size larger than inlet port size. Pressurize and
dual feed.
DIAGNOSIS AND MAINTENANCE
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