393-7887 3937887 Original Engine Parts 313D2 GC

Q: What different raw materials make up all spare parts within this repair kit?
A: The kit is composed of four core materials: PU, bronze-filled PTFE, FKM and oil impregnated fabric.
Q: What natural original color does each material seal present without extra pigment?
A: PU sealing rings are creamy off-white, bronze-filled PTFE parts carry bronze gray tone, FKM rubber accessories are deep chestnut brown, impregnated fabric wear rings are tawny reddish brown.
Q: What is the core sealing responsibility undertaken by PU components in cylinder operation?
A: PU serves as primary dynamic sealing member, relying on good elasticity to block hydraulic oil leakage during high-frequency piston reciprocating movement.
Q: What is the essential purpose to match bronze-filled PTFE as backup ring together with PU seal?
A: It fills the assembly gap and prevents the soft PU main seal from being extruded and damaged under instant high hydraulic pressure impact from heavy load startup.
Q: Compared with regular common rubber, what unique merits does FKM material possess?
A: FKM stands out with outstanding high temperature resistance and excellent anti-corrosion capacity against deteriorated aged hydraulic oil in long-running mining equipment.
Q: On which specific cylinder positions will FKM rubber O-rings and small seals be installed?
A: FKM pieces are arranged for static sealing on high heat zones such as cylinder end cap joints and pipe thread connection gaps.
Q: What practical mechanical function does impregnated fabric wear ring accomplish on piston assembly?
A: It plays the role of guiding and positioning the piston, avoiding eccentric swing and lowering wear loss between piston outer diameter and cylinder inner wall.