07010-00020 0701000020 NBR PU FKM Composite Oil Seal Kit for Bulldozer Hydraulic Cylinder Overhaul GD30-4 GD30-5M

1. Quick Details of  seal 07010-00020:

2. 07010-00020  parts on group :

3. 07010-00020  picture:

4. Service part number :

5. FAQ

Q: Which bulldozer models and hydraulic cylinders does this 07010-00020 seal kit match, and what parts are contained in the kit?
A: This seal kit fits mainstream heavy-duty bulldozers and their matched lift, tilt and steering hydraulic cylinders. It covers all sealing accessories required for one full cylinder overhaul, including rod oil seal, piston seal, PU buffer ring, PTFE wear rings, FKM O-rings, dust wiper and anti-extrusion back-up rings, eliminating the trouble of purchasing scattered seals separately during maintenance.

Q: Why combine NBR, PU, FKM and PTFE four materials for bulldozer cylinder sealing?
A: Bulldozers work on rough ground with heavy impact load, continuous vibration and drastic temperature swings. NBR main seals balance oil resistance and elasticity for daily hydraulic sealing. PU buffer seals absorb instantaneous pressure impact to protect core sealing lips. FKM O-rings withstand high temperature and oil aging for long-hour operation. PTFE rings reduce metal friction and stop seal extrusion under peak pressure, forming a multi-layer protection system to extend service life.

Q: What color and structural appearance do each component of this kit have?
A: NBR main oil seals are solid black with double-lip U-shaped structure. PU buffer rings are light yellow with tapered shock-absorbing outline. FKM O-rings are brown with smooth uniform cross-section. Milky white PTFE flat rings are thin and flat without burrs. The dust wiper is black with outward dust-blocking lip. Each part has precise size, easy to distinguish during disassembly and assembly.

Q: What temperature and pressure scope can this seal kit withstand?
A: The whole set works steadily under continuous working pressure up to 390 bar. NBR and PU parts adapt to -33°C ~ +120°C, FKM O-rings can support -25°C ~ +140°C. It can adapt to cold mountain construction in winter and long-time high-load earthmoving in summer without swelling, cracking or oil leakage.

Q: What negative consequences will inferior seal kits bring to bulldozer hydraulic systems?
A: Low-cost seal kits use recycled raw rubber without PU buffer and PTFE protection. They wear rapidly under frequent impact, leading to internal and external oil leakage of cylinders. The bulldozer will have weak lifting force, slow steering response and unstable movement. Worn rubber debris will scratch cylinder barrels and piston rods, bringing expensive replacement costs and long construction halt.

Q: What key installation rules should technicians follow to prolong seal service life?
A: First, fully polish cylinder grooves, piston and rod surfaces to remove old seal residues and metal burrs. Second, coat all seals with clean hydraulic oil for lubrication, never use thick grease. Third, install seals in correct direction: sealing lip faces pressure oil side. Fourth, embed PTFE backup rings flat without warping before assembling main seals. Fifth, test cylinder at low pressure for 20 minutes to check leakage before full-load operation.

6. Exhibition and Wearhous

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