5 Common Causes of Low Pressure in Manual Pallet Jacks

A healthy hydraulic system is essential for a manual hydraulic pallet jack; any hydraulic failure will directly affect its lifting performance. Low pressure in manual pallet jack is a common issue many users face, so what should you do when it happens? Below are the most frequent causes to help you quickly diagnose and fix hydraulic problems.

1. Low or Contaminated Hydraulic Oil

Symptoms: Light pumping, slow lifting, or no lifting at all.

Hydraulic oil level drops or air enters the system over time.

Oil becomes dirty, emulsified, or degraded, resulting in insufficient pressure.

2. Worn or Leaking Seals

Symptoms: Gradual loss of pressure, weak lifting, and visible oil leakage.

Piston seals age, wear, or deform.

Cylinders of the manual pallet jack develop seepage or dripping.

3. Misaligned Release Valve or Handle

Symptoms: No lifting or sudden pressure loss after slight lifting.

Handle not fully returned to the lifting position.

Release valve stuck or weak spring tension.

4. Worn Pump Core or Internal Pressure Loss

Symptoms: Normal lifting when empty, no pressure under load.

Internal sealing surfaces wear out and fail to hold pressure.

Lifts well without load but cannot raise heavy loads.

5. Air Entering or Clogged Hydraulic Lines

Symptoms: Jerky lifting, unstable pressure, and uneven height.

Dirt blocks the hydraulic lines.

Air enters the cylinder or pump body.

Filter or hydraulic passages are clogged.

In conclusion, you can troubleshoot your manual pallet jack by checking the five situations above. If you still cannot identify the problem, it may be more complex, and professional repair service is recommended.