John Deere Hydraulic System Leaking Oil
Fix Oil Leaks Effectively During Operation
With John Deere tractors, oil-moist hydraulic components, pressure loss, or oil drops at hoses and valves are typical signs of hydraulic leaks. The cause is usually worn O-rings, shaft seals, control units, or hydraulic cylinders. In particular, polymer-based seals lose their elasticity over time due to pressure, temperature, and operating hours and no longer provide a proper seal.
With LecWec, you can restore the functionality of these seals directly during operation without dismantling control units, cylinders, or valves.
✓Oil Stop Leak for John Deere hydraulic systems
✓Targets O-rings and shaft seals specifically
✓Oil sealant without chlorine
✓Seal leaks without downtime or disassembly
How LecWec Works in John Deere Hydraulic Systems
In John Deere tractor hydraulic systems, polymer seals such as O-rings, shaft seals, and sealing lips are used in control units, valves, and cylinders. Due to continuous operation, pressure peaks, and temperature, these seals lose their plasticizers over time. They become hard, shrink, and lose their sealing performance. This is exactly where LecWec takes effect during normal operation.
After being added, LecWec circulates through the hydraulic oil and reaches all relevant sealing points within the system – including internal control blocks and valves. The active formula is absorbed by the polymer seals and helps restore their original properties. The material becomes flexible again and fits tightly against the sealing surfaces. This closes the typical leakage gaps.
In practical use, this means that oil loss is significantly reduced or stopped, provided the cause is aged seals. Mechanically damaged components or worn piston rods remain unaffected.
Only 3% of the total oil quantity.
LecWec is chlorine-free.
For all oil systems and types.
Direct delivery from the manufacturer.
It happened even faster than I expected.
"I have to report positively that the level matches the oil... unbelievable. [...] I wouldn’t have believed that the steering gearbox would be sealed again after just under a week."
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"...nothing was leaking anymore!!!
I am truly very satisfied. At first, I did not believe the product would work, but now I am completely convinced and also saved many hundreds of euros!"
- Jürgen R.
Oil leak at the cylinder base gasket
Verified review (Learn more)"I did not believe it at first, but your product is excellent! [...] I ordered just one can and everything is sealed already, even though you recommend 2 cans, meaning 200 ml, for 6 liters of oil. Many thanks!"
- Andreas F.
Oil leak problems at the oil flange gasket
Verified review (Learn more)"...which made it even more satisfying when, after around 3 weeks, I noticed that the oil loss had gone down to zero – the steering rack was sealed again!! Even now, after 4 months, the reservoir is still at the maximum level."
- Friedger F.
Oil leak at the steering rack
Verified review (Learn more)"There was always a small puddle of oil collecting underneath the vehicle. I added 100 ml of LecWec to around 4 liters of oil. Since then, I have driven many miles and was surprised to find that there was no more oil on the ground at all."
- Paul R.
Leak at the oil pan
Verified review (Learn more)
How to Seal a John Deere Hydraulic System in 3 Steps
If your hydraulic system is leaking, this is usually noticeable through oil-moist control units, oil drops at hydraulic lines, or loss of hydraulic pressure. In many cases, aged O-rings or shaft seals inside the system are the cause. Instead of dismantling components immediately, you can address the issue directly within the system.
Step 1: Check the oil level and roughly identify the leak location (for example control unit, cylinder, or hydraulic lines).
Step 2: Add LecWec directly to the hydraulic reservoir at a ratio of 3% of the total oil volume.
Step 3: Operate the tractor normally – activate the hydraulic functions multiple times so the additive circulates throughout the system.
The polymer seals absorb the active formula, become flexible again, and fit tightly against the sealing surfaces once more. This reduces or stops oil leaks at typical John Deere weak points. You avoid downtime and unnecessary disassembly.
John Deere Hydraulic System Leaking Oil? These 5 Tips Help
Identify the leak source precisely
Clean the hydraulic components and observe the system during operation. This helps determine whether the control unit, cylinder, or hydraulic line is leaking.
Check system pressure and load
High pressure peaks or continuous heavy loads put additional stress on seals. Inspect system settings and operating conditions.
Inspect control valves and couplings
Leaks often occur at quick couplers or hydraulic control blocks. Check these areas carefully.
Restore seals in a targeted way
John Deere hydraulic systems use many O-rings and shaft seals that harden over time. This is exactly where LecWec can restore sealing performance.
Use LecWec correctly and monitor the results
Dose LecWec at 3% of the oil volume and continue operating the hydraulic system normally. Monitor the known leak points afterward. In many cases, oil leakage is significantly reduced or completely stopped.