Hydraulic VRC Common Problems
Hydraulic VRCs are used in a variety of applications around the world. Many buyers are attracted to the lower price initially because they do not understand the true costs accrued over time due to the number of problems that can occur with this type of lift. Custom Industrial Products manufactures all-mechanical VRCs.
Common Issues You May Experience
The platform will raise, but not lower.
Either the dump valve is not actuating or the velocity fuse has triggered.
The platform drifts down from its raised position.
Three to four (feet) of drift overnight is normal for hydraulic VRCs, but you may also have internal leakage.
The platform is spongy or bouncy.
You most likely have air in your cylinders.
The platform lowers, but stops early.
Your dump valve is not working properly.
Motor and Pump Problems
My lift doesn’t operate when the pushbuttons are activated.
It is probable that the pressure switch has been activated.
Motor stops before reaching the next level.
You could have piston or cylinder interference or the pressure switch may be activated.
Motor runs but platform does not raise.
First, if there is no pressure shown on the guage, it could be any of the following:
- The oil in the reservoir is less than 3/4 full.
- The relief valve setting is too low.
- The pump is cavitating. (or tooltip this word for a definition)
- There is contamination or the pick-up tub is plugged.
- The oil is foaming.
- There is a low oil level.
If the gauge shows low or erratic pressure, then it is likely that the oil level is low or that the oil is foaming.
The motor or pump keeps running after pressure reaches the relief valve setting.
It could be that the relief valve is set too low, or that the pressure switch is set too high, or it could simply be a bad pressure switch.
The pump stops suddenly.
The major internal pump has failed.
There is excessive pump noise.
There are three potential causes here:
- You have a damaged or worn pump.
- You may be experiencing Cavitation. Cavitation is a vacuum in the fluid cause by a restricted or sharp bend in the inlet line, a clogged filter or by fluid that is too high in viscosity. The characteristic sound of cavitation is a high-pitched scream.
- You may have an aeration issue. Aeration is the presence of excessive air, usually in the form of bubbles disbursed through the fluid caused by a damaged inlet or return line, or from a loose or defective fitting(s) or seal(s). Other possible causes include a damaged or worn cylinder rod, pacing or seals, cracked junction blocks, tees or piping, fluid level too low, air trapped in the filter or excessive air trapped after adding fluid. Symptoms of aeration are overheating or jerky and uneven movement in the pump or cylinders.
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