AT340155 Cab Door Gas Operated Pneumatic Cylinder | Gas Spring Replacement Fits John Deere Backhoe Loaders 310 Series, 410 Series, and 710 Series

• Factory-precision fit, zero installation barriers
  100% identical dimensions to OEM parts. Pin hole diameter (φ12mm) and mounting spacing (220mm) perfectly match door hinges—no modifications to cab frame or door structure required. Replacement involves simply removing both end pin bolts, aligning mounting holes, and tightening. The entire process takes less than 15 minutes, allowing non-professionals to complete it quickly and significantly reducing maintenance costs.
• Exceptional Durability in Harsh Environments, Far Surpassing Generic Parts
  Designed with triple protection for excavator-loader operations:
  ① Cylinder body features a 15μm thick anodized coating, offering corrosion resistance three times greater than standard aluminum alloys; ② Piston rod undergoes zinc plating + passivation treatment, achieving 480 hours of salt spray testing without rust; ③ Shaft ends feature labyrinth-type dust seals, blocking 98% of mud and gravel from entering the sealing chamber. In muddy farmlands, construction debris, and similar environments, service life exceeds that of standard gas springs by over 60%.
• Stable Support + Cushioning Protection: Dual Safety Assurance
  The nitrogen gas chamber delivers uniform support force, securely locking the cab door at any angle (e.g., 30° for temporary access, 90° for extended operation). This prevents accidental door closure on bumpy terrain, eliminating the risk of pinching operators. During door operation, the built-in damping mechanism reduces impact speed by 50%, minimizing rigid collisions between the door and frame. This extends the lifespan of associated components like hinges and locks.
• Effortless Operation, Reduced Labor Intensity
  The single-acting mechanism reduces the force required to open the door by 70%. Operators need only apply light pressure to open the door, while spring-assisted closing prevents fatigue from heavy door weight. This design is particularly suited for prolonged operations involving frequent entry and exit, enhancing the equipment's ergonomic performance.

1. Is the AT340155 compatible with all 310/410/710 models? How can I verify this?
Compatible with 310G, 310P, 310J, 310K, 310K EP, 310L, 310L EP, 310SG, 310SJ, 310SK, 310SL, 310SL HL, 310TJ, 310TK TMC, 315 P, 315J, 315SG, 315SK, 315SL, 320 P, 325J, 325SK, 325SL, 410 P, 410G, 410J, 410K, 410L, 410TK TMC, 710 P, 710G, 710J, 710K, 710L, and other mainstream sub-models, excluding door body modification machines. Verification methods: ① Check VIN code + model AT340155 on official website; ② Measure old part cylinder diameter (φ30mm) and mounting spacing (220mm)—compatible if matching new part specifications.

2. Is this a gas spring or a cylinder? How does it differ from standard gas springs? 

It is a cylinder with gas spring functionality. Key differences: ① Integrated nitrogen chamber and return spring, eliminating external air supply; ② High protection rating (IP65), resistant to mud and debris; ③ Stable support force (350N), capable of 50,000 cycles, outlasting standard gas springs.

3. What tools are needed for field installation? How tight should bolts be?
You'll need a socket wrench, torque wrench, and rust-proof spray. The pivot pin bolt must be tightened to 15±2 N·m. If too loose, the door will wobble; if too tight, it may strip. Pay extra attention to torque on construction sites with high vibration.

4. Door sagging—can replacing the cylinder fix it?
Check two points first: ① Replace hinges if gap exceeds 2mm. ② If old cylinder presses without resistance, it's leaking and failed. Replace only the cylinder. If hinges are damaged but not replaced, the new cylinder won't work.

5. Why does the door stick during opening/closing or fail to lock at angles after installation?
Common causes: ① Misaligned cylinder—loosen bolts and realign; ② Lack of lubrication on pivot pins—apply lithium-based grease; ③ Bent piston rod—replace with new part.

6. Can I add nitrogen myself when support force decreases? What precautions should I take?
Not recommended. Requires specialized equipment. If absolutely necessary: ① Purge existing gas to prevent performance degradation from mixing; ② Pressure must not exceed 0.6MPa—overpressure will damage seals; ③ Securely tighten fittings to prevent leaks.

7. Oil/gas leakage at shaft ends—is it faulty? How to repair?
Typically caused by aged seals or damaged dust rings. Solution: Replace with genuine nitrile rubber seals. Apply hydraulic oil before installation—never use grease to avoid system contamination.

8. Does reduced support force in winter indicate a fault?
Normal. Nitrogen pressure slightly decreases in cold conditions. Gently warm the cylinder body (wipe with lukewarm water) or monitor after temperatures rise. If force remains inadequate, replenish nitrogen. 9. How to maintain it regularly? How often should it be inspected?
① Wipe the cylinder body every 15 days to check for scratches or leaks.
② Lubricate the pivot pins monthly with grease.
③ Inspect seals every six months. Test support force annually; if sag exceeds 5mm, refill nitrogen.

10. Can a piston rod with a dent from a stone impact still be used?
Do not use it. The dent will wear out the seals, causing air leakage. While it may function temporarily, leakage is inevitable over time. Replace it with a new one as soon as possible.