Liftmoore provides an adapter fitting with all hydraulic cranes. Step #7 The cause of most failures of hydraulic systems is trash or impurities in the oil. At lower voltages amperage draw will increase and motors and solenoids will heat up rapidly under these conditions. Voltage readings below 11.5 VDC are not adequate. There may be adequate voltage before operating the crane but it will decrease as it is running.
Step #6 The crane must be running when voltage is measured. The crane’s voltage when running must be above 11.5 VDC. A test light may continue to burn even though the voltage is too low. A test light may not give you the information needed. Step #5 Always use a volt meter (multi-meter) when checking the crane.
Loose or bad connections are the same as having a bad battery. A bad or weak battery will not allow the crane to operate as it is intended. Step #4 All DC powered cranes must have good voltage with adequate battery reserve to function. If it works manually the problem is electrical, not hydraulic. Locate the function that is not working and check it manually. On electric cranes the pump must be working before operating the valve manually. The button is located on the end of the valves and may be pushed or pulled to operate the valve. Step #3 Manual override features are located on all hydraulic valves. This will determine whether or not a safety circuit is tripped. Step #2 What functions do not work on the crane? What functions are working? Check every function when something is not working. Second check the pendant control connection and that it has voltage and is sending signals to the valves or relays. Step #1 If nothing works, first check for battery voltage and/or hydraulic power below the crane.
View thousands of Crane Specifications on View thousands of Crane.īasic troubleshooting guide & information This information covers basic procedures and information needed to aid you in trouble shooting and understanding issues with your crane. Manual pull out one side Slides on low friction polymer slide pads Convenient spring pin horizontal locking when extended. For corner mounted cranes, they provide the maximum. Signed for use with Liberator 4000 and larger cranes on trucks up to 33,000 GVW.
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