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Lifter operation is erratic, lifter does not move smoothly
When the lifter does not move smoothly, there is typically air in the system. This is usually an issue after
the initial installation or a recent repair where the hydraulic lines may have been opened. Bleed air out
of the system by loosening a fitting very slightly and running the hand valve to create flow. Excess air
should bleed out of the opening in the fitting. Retighten when complete done.
In rare instances, the flow may be too low. This would also be noticeable if the lifter was also very slow.
Try adjusting the diverter valve to increase the flow.
Another possibility is the adjustable flow control, D63575 not functioning properly. Check the arrow
printed on the valve body. The valve should be installed so the arrow points away from the actuator.
Adjust, clean, or replace the adjustable flow control valve as needed.
Cart lifter will not pick up the weight
The cart may be overweight. If the cart is obviously very heavy and hard to move, try removing a few
items from the top to lighten the load.
The hand valve relief pressure setting may be set too low. Check and adjust the pressure using a
pressure gage. Note the pressure being delivered and adjust accordingly.
If adjusting the hand valve's relief does not bring the pressure up to where it should be, then the truck's
relief pressure setting may be set too low. Try adjusting the truck's relief valve (see manufacturer's
instructions on how to do this for your vehicle)
In cases of older equipment, the hand valve may be in need of replacement or repair.
If all pressures are set properly and the hand valve works, then the cylinder may have internal leakage.
Test for internal leakage by running the lifter all the way up and dead-head the lifter up. Note the
pressure gage and see that the pressure stays constant as the hand valve is held depressed. If the
pressure falls, you may have internal leakage and the cylinder should be repaired/rebuilt with new seals.
Perkins Manufacturing Company
Creators of the TuckAway
www.perkinsmfg.com
Cart Lifter
®
Troubleshooting Guide
800-882-5292
Revised: 5/7/2019
Page 27
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