Product feature: Cat Advansys pumps and motors

Cat pumps and motors are designed by Caterpillar to deliver optimal Cat machine performance

For optimal hydraulics system operation, the performance and durability of pumps and motors is critical. Since they’re precisely designed and manufactured to meet the requirements of Cat equipment, genuine Cat pumps and motors offer high standards of quality and reliability, its manufacturer says.

Here’s another critical point: don’t wait for failure. As Caterpillar’s aftermarket services consultant for hydraulics Chloe Xie says, "Waiting for failure can result in unplanned downtime and additional costs. So be sure to watch for warning signs and repair indicators."

It’s sound advice. The table below highlights some of the key repair indicators and possible causes. Keep an eye out for them or talk to a Cat dealer about the right service options.

Product feature: Cat Advansys

Cat pumps and motors are designed by Caterpillar to deliver optimal Cat machine performance, its manufacturer says. Cat pumps and motors are also made using
high-grade materials to help deliver toughness, power, productivity, and reliability.

Cat dealer also offers aftersales support by ensuring customers always have the right parts and service solutions, customised to their equipment and operation. With their expertise in Cat components and their applications, dealers can guide customers in properly fine-tuning and optimising the hydraulic pump and motor control settings.

Their diagnostic services can pinpoint problems and provide solutions. Many Cat dealers use specialised equipment such as a testbench for testing and tuning pumps and motors, which helps them be more precise in their repair and replacement recommendations. This can reduce rework and keep service and repair bills to a minimum.

Repair indicators

Possible causes


System pressure too high
Scored or bent cylinder rod
Failed or incorrect seals
Improperly torqued hose connection
Worn or damaged hoses, tubes, and fittings
Missing guards

Excessive cylinder drift

Valve adjustment needed
Scored cylinder
Failed seal or seals
Scored valve
Contaminated oil

Slow cycle times

Engine performance
Faulty valve
Low fluid level
Worn system components
Contaminated oil

Noisy operation

Engine performance
Low fluid level
Restriction in system
Worn system components
Faulty relief valve

System overheating

Faulty oil cooler
Low fluid level
Plugged filter
Worn system components
Faulty relief valve
Wrong viscosity or contaminated oil
Restriction in system
Poor operator habits

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