XCMG QY70K Luffing Cylinder Seal Kit
The luffing cylinder raises and holds the boom, making both sealing and load-control diagnosis essential.
The Match That Matters
Tell us whether the issue is rod leakage, boom drift or jerky luffing.
What the Symptom Really Tells You
Boom drift can come from piston seals or the holding valve. Jerky motion may involve air, guides or oil condition.
Workshop Notes
Mechanically support the boom, rebuild cleanly, bleed carefully and complete leakage plus holding tests.
XCMG Balance Valve 803001825 · XCMG QY50K Hydraulic Pump 803000260
Buyer FAQ
Will seals fix all boom drift?
No; isolate the holding valve too.
Why inspect the rod?
Scoring quickly damages new seals.
What is the final safety check?
Controlled luffing and verified boom holding.
Packing: Seal groups are labelled and kept clean and undeformed.
