Product Overview

The 4448399 arm cylinder seal kit is an aftermarket hydraulic seal kit for the arm (stick) cylinder of Hitachi ZX200-class excavators. The part number 4448399 appears in Hitachi parts listings as a seal kit, and it is cross-referenced by the US distributor Hercules Sealing Products (HIT-4448399-EX) for the ZX200 / ZX210 / ZX240 family, as well as by aftermarket suppliers in Europe and Asia. Rebuilding the arm cylinder with a matched kit restores digging-force accuracy, eliminates oil leaks and prevents the arm from drifting while the machine is under load.

At DJF Seals the kit is manufactured factory-direct for parts wholesalers, excavator repair shops and rental fleets that standardize on the Hitachi ZX200-series platform.

Verified Application

Source conflict – bore size: the DJF listing states 130 mm bore; Hercules Sealing Products and soonparts both state 135 mm bore (rod 95 mm agrees across all sources). Measure your cylinder or read the stamped part number before ordering, and tell us your bore size in the inquiry.

Model list gap: the DJF listing’s generation codes (ZAX200-3/6/8, ZAX210-3, ZAX225US-3, ZAX200-3G/5G) were not found in independent sources; the externally confirmed coverage is the ZX200 / ZX210 / ZX240 family plus ZX225US and ZX360W-3 variants listed by marketplace suppliers.

Replacement Scope

The kit is intended to replace the complete sealing set of one arm cylinder: rod seal, piston seal, wiper, guide/wear rings and static O-rings. Arm cylinders see constant two-way loading while digging and dumping, so the set must hold pressure in both directions and keep fines and moisture out of the bore.

Marketplace listings for this number carry cross-references TE07941, 4661594, 4364916 and 4477841; these are aftermarket interchange numbers found in public listings, not confirmed OEM numbers. Component quantities per kit are confirmed against your cylinder at order time.

Fitment Verification

• Confirm the cylinder position: arm (stick) cylinder.
• Confirm the bore: 135 mm per the majority of independent sources (the DJF page lists 130 mm – measure to be sure). Rod: 95 mm.
• Confirm the machine is in the ZX200 / ZX210 / ZX240 family or one of the ZX225US / ZX360W-3 variants listed by marketplace suppliers.

Factory Inspection & Packing

Each 4448399 kit is assembled in our factory from compound-checked seal batches, gauged against the picking list, and packed with the sealing lips protected for transit. Packs carry the part number label and ship in reinforced cartons with the packing list, ready for air or sea freight to your workshop or warehouse.

Wholesale Ordering

DJF manufactures the 4448399 kit and the companion Hitachi ZX200-series kits, so wholesale buyers can consolidate boom, arm and bucket kits for the same machine family in one shipment. Factory-direct supply means one quality standard, stable stock for repeat orders and competitive bulk pricing.

Minimum Order Quantity (MOQ)

MOQ: 5 kits. Single-kit trial orders are accepted for fitment testing; tiered wholesale pricing applies at volume. Ask our export team for the current MOQ, price breaks and lead time for the 4448399 arm cylinder seal kit.

FAQ

Q: Which machines does the 4448399 arm cylinder seal kit fit?

A: Per independent sources, the Hitachi ZX200, ZX200LC, ZX210, ZX210LC, ZX210LCH, ZX210K, ZX210LCK, ZX210N and ZX240 excavators, with ZX210H, ZX210W, ZX225US, ZX225USRK and ZX360W-3 added by marketplace listings. The DJF page lists ZAX200 / ZAX210 / ZAX225 generation codes that were not independently confirmed.

Q: What is the bore and rod size of the 4448399 kit?

A: Independent sources (Hercules Sealing Products, soonparts) state rod 95 mm x bore 135 mm. The DJF listing states 130 mm bore. Measure your cylinder before ordering and note the bore in your inquiry.

Q: What do the cross-reference numbers TE07941, 4661594, 4364916 and 4477841 mean?

A: They are interchange numbers found on public marketplace listings for this kit. They can help you locate the same kit under different catalog codes, but they are not confirmed Hitachi OEM numbers.

Q: Do you also have the boom and bucket kits for the same machines?

A: Yes. We manufacture the companion 4448398 boom cylinder seal kit and 4448400 bucket cylinder seal kit for the Hitachi ZX / ZAX200-series, and both are listed on this site.