123-4003 1234003 76.2mm shaft diameter rubber lip seal of 528B 525D 525C 525B 530B

Q: Can you confirm the part number and which construction machine this sealing spare fits?
A: The part number is 123-4003, this o-ring is developed for excavator travel motor valve block assemblies.

Q: What is the part name of spare part 123-4003 and which spare group does it belong to?
A: The part name is O-Ring, it belongs to high pressure resistant rubber seals for excavator travel hydraulic valve blocks.

Q: What material is used to produce the 123-4003 o-ring?
A: It is made of fluorocarbon rubber with excellent heat resistance and stable performance under high pressure.

Q: What main role does this excavator o-ring play when the machine travels forward or backward?
A: It seals the mating gaps inside the valve block to lock pressure and stop internal oil bypass.

Q: Where is the 123-4003 o-ring generally installed on the travel motor?
A: It sits in precision grooves on the valve block surface and control spool end connections.

Q: What temperature range can this FKM o-ring sustain during continuous heavy travel work?
A: It maintains dependable sealing performance between -19℃ and 201℃ under heavy loads.

Q: What should we check on the valve block surface before installing this o-ring?
A: Check for tiny scratches on the mating face and remove sludge and old seal debris thoroughly.

Q: What hydraulic fluid matches well with the 123-4003 FKM sealing ring?
A: It works properly with high grade anti-wear hydraulic oil used in heavy-duty excavator travel systems.

Q: What unique advantage does this o-ring have for excavator travel motor applications?
A: It can handle repeated impact pressure when the machine starts, stops and changes travel direction.