07010-00025 0701000025 NBR PU FKM Composite Oil Seal Kit for Bulldozer Lift & Tilt Hydraulic Cylinder Maintenance GD37-5H D55S-3

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2. 07010-00025  parts on group :

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5. FAQ

Q: What practical advantages does the four-material matching design bring to bulldozer hydraulic cylinder sealing?
A: Bulldozers operate on rough construction sites all year round, bearing heavy impact loads, continuous long-hour vibration and obvious seasonal temperature differences. NBR main seals have balanced oil resistance and elastic recovery to cope with daily conventional hydraulic sealing. PU buffer rings absorb instantaneous hydraulic pressure spikes to avoid direct impact damage to the core sealing lip. FKM O-rings resist high temperature and oil aging, adapting to non-stop full-load operation. PTFE flat rings reduce friction between metal parts and prevent the seal from being squeezed and cracked under peak pressure, forming multi-layer protective structure to extend overall service life.

Q: What color and structural features do each component of this seal kit have?
A: NBR main oil seals are solid black with double-lip U-shaped structure and smooth sealing surface. PU buffer rings are light orange with special tapered shock-absorbing outline. FKM O-rings are coffee brown with uniform round cross-section without deformation. Milky white PTFE backup rings are thin flat rings with burr-free edges. The dust wiper is black with an outward dust-blocking lip. Every part has standard unified sizes, which can be quickly sorted and identified during on-site assembly.

Q: What stable working pressure and temperature range can this whole set of seals withstand?
A: This composite seal kit can continuously bear stable working pressure up to 400 bar. NBR and PU components work normally within -34°C ~ +120°C, while FKM O-rings can adapt to -25°C ~ +140°C. It can maintain stable sealing performance in low-temperature mountain construction in winter and long-hour full-load earthmoving work in summer, without swelling, hardening, cracking or internal and external oil leakage.

Q: What hidden risks and economic losses will low-quality seal kits bring to bulldozer hydraulic systems?
A: Cheap inferior seal kits adopt recycled waste rubber without PU buffer and PTFE anti-extrusion protection layers. They wear rapidly under frequent impact and vibration, leading to serious internal and external oil leakage of hydraulic cylinders. The bulldozer will show weak lifting force, slow steering response and obvious jitter during operation. Worn rubber debris will scratch the piston rod and cylinder inner wall, resulting in expensive metal part replacement costs, and long equipment shutdown will delay construction progress and cause extra operation losses.

Q: What standardized installation steps should maintenance technicians follow to extend the service life of the seal kit?
A: First, thoroughly clean the piston groove, cylinder inner wall and piston rod surface to remove old seal residues, metal burrs and oil dirt. Second, evenly coat all sealing parts with clean unused hydraulic oil for lubrication; thick grease is forbidden to prevent rubber swelling failure. Third, install each seal in the correct direction, ensuring the sealing lip faces the high-pressure oil side. Fourth, lay the PTFE backup ring flat without warping before assembling the main oil seal. Fifth, after assembly, run the cylinder at low pressure for 20 minutes to check all sealing positions for oil leakage before putting the equipment into full-load construction.

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