When a pallet jack refuses to lower, it can disrupt warehouse or distribution center operations. The issue often lies within the hydraulic system that controls the jack's lifting and lowering mechanism. In this article, we'll go over the common reasons why your pallet jack won't go down and provide step-by-step instructions on how to fix it.
Why Your Pallet Jack Won’t Go Down? Common Causes
Before diving into the fixes, let's discuss why a pallet jack might refuse to lower. Understanding the root cause will help you troubleshoot and apply the appropriate solution more effectively.
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There are several reasons why your pallet jack might not be lowering correctly. It could be due to a faulty release valve, a broken or misaligned spring, a loose or misaligned chain, a damaged hydraulic pump, the air in the hydraulic system, or a lack of lubrication between the handle and fork linkages.
Let's get into the steps to fix it.
Steps to Fix a Pallet Jack that Won’t Go Down
1. Faulty Release or Lowering Valve
If your pallet jack won't go down, the release valve is one of the first components to check. The release valve, also known as the lowering valve, allows the hydraulic fluid to flow back into the reservoir, causing the forks to lower. The forks won't go down if this valve is stuck or damaged.
Here's what you can do to fix this:
- Locate the release valve at the bottom of the handle or near the hydraulic pump.
- Check if the valve is stuck or not moving freely.
- Try lubricating the valve with a penetrating oil or silicone spray.
- If the valve is damaged, replace it with a new one.
2. Broken or Misaligned Spring
Another common issue is a broken or misaligned spring. The spring plays a crucial role in supporting the weight of the load and assisting in the lowering process. It can hinder the lowering function if it's damaged or not properly aligned.
You'll need to locate the spring, typically near the hydraulic pump or the fork linkage, to address this issue. Check if the spring is broken, stretched, or out of place. If the spring is broken, replace it with a new one. If it's misaligned, carefully adjust it to its proper position using pliers or a pair of locking pliers.
3. Loose or Misaligned Chain
A loose or misaligned chain may also cause the pallet not to lower properly. The chain connects the handle to the fork linkages. It helps to transfer the motion of the handle to the lifting mechanism. If the chain is loose or misaligned, it can cause slack or interference in the movement and prevent the forks from lowering.
If the chain is in good condition, you can tighten it by adjusting the tensioner or tightening the secure bolts. Ensure the chain's maximum tension or torsion limit must meet the manufacturer's instructions. However, a complete replacement would be the best bet if the chain is severely worn or damaged.
4. Clogged or Damaged Hydraulic Pump
A clogged or damaged hydraulic pump can also cause issues with lowering. The hydraulic pump generates lifting pressure. If the pump is clogged due to dirt or debris or damaged by wear and tear, it can reduce or stop fluid flow and affect the lifting and lowering functions.
Follow these steps to address this issue:
- Check for any visible damage or leaks in the pump.
- If the pump is clogged, disassemble it and clean it thoroughly with a degreaser. You can also try flushing the system with a hydraulic fluid cleaner.
- If the pump is damaged, replace it with a new one.
5. Air in the Hydraulic System
The hydraulic system is a closed circuit that contains hydraulic fluid, hoses, valves, and cylinders. It relies on constant pressure to operate smoothly. If air gets into the system, it can create bubbles that disrupt the pressure and cause erratic or no movement of the forks.
To fix this problem, you'll need to bleed the hydraulic system to remove any trapped air. You can bleed the air by pumping the handle several times while holding the trigger. You can also do this by opening the bleed valve (if your pallet jack has one) and letting the fluid drain until no bubbles come out.
Refer to your pallet jack's manual for specific instructions on how to bleed the hydraulic system properly.
6. Lack of Lubrication Between Handle and Fork Linkages
The next cause could be a lack of lubrication between the handle and fork linkages. The handle and fork linkages are moving parts that require proper lubrication to function smoothly. If these components are dry or lack lubrication, it can cause the forks to become stuck or difficult to lower (due to friction).
Locate the pivot points and linkages between the handle and forks to fix this issue. Apply a high-quality lubricant, such as a lithium-based grease or a penetrating oil, to these areas. Ensure that the lubricant is evenly distributed, and move the handle back and forth to help the lubricant penetrate the moving parts.
Conclusion
And there you have it. Dealing with a pallet jack that won't go down can be frustrating, but following the steps outlined in this blog, you can troubleshoot and resolve many common issues. Remember, proper maintenance and regular inspections are essential to keeping your pallet jacks in top working condition.
When to Call for Professional Help?
While many of these issues can be fixed with some basic troubleshooting and repairs, there may be times when professional assistance is required. If you've tried all the steps mentioned above and your pallet jack still won't go down or encounter any issues beyond your skill level, it's best to call a professional repair service. A qualified technician can diagnose and repair any underlying issues more effectively.