QY70K Telescopic Cylinder I Seal Kit – Variant 1
This page covers Variant 1 for telescopic cylinder I and is intentionally separated from later kit revisions.
| Customer priority | Confirm the old kit profile and cylinder build date before supply. |
| Evidence needed | Cylinder label Variant 1 evidence Rod/bore measurements Piston/gland profiles Wear rings and wiper
|
Diagnosis Before Replacement
External leakage and internal boom creep require different checks; isolate valve leakage before rebuilding.
Fit, Test and Handover
Document seal orientation, protect lips during assembly and pressure-test across the operating stroke.
Useful Internal References
XCMG Balance Valve 803001825 · XCMG QY50K Hydraulic Pump 803000260
FAQ
Why separate variants?
Seal geometry may differ.
Can photos identify it?
Photos plus dimensions and labels are best.
Should wear rings be renewed?
Replace when worn or specified.
Export preparation: Variant 1 seals are bagged by position.
