Overview — Valve Rocker Arm 1126100802
1126100802 is the valve rocker arm for the Isuzu 6WG1 six-cylinder engine that powers Hitachi large excavators. We can supply all the original and replacement part numbers listed below, in stock or available on order — welcome to enquire by part number.
Parts Characteristics
The 6WG1 is a 147 mm bore × 154 mm stroke, overhead-camshaft, gear-driven-timing engine, and this rocker arm is the forged steel lever that sits between cam and valves. It carries a hardened pad that rides the valve stem, a bronze-bushed pivot bore at the centre, and a mechanical lash adjuster — adjusting screw plus locknut — on the cam side. The pad surface, pivot bore and thread condition decide valve-train accuracy and service life, which is why OEM-spec material and heat treatment matter.
Applicable Models & Applications
The rocker arm is specified for Hitachi ZX450, ZX470-3, ZX650 and ZX670-3 excavators fitted with the 6WG1 engine, and it suits any 6WG1-powered machine using the same valve-train layout. It is an in-head wearing part, typically replaced during valve-train overhauls and cylinder-head rebuilds.
Maintenance & Replacement
Set the valve lash with a feeler gauge at TDC on the compression stroke of each cylinder, using the cold clearances in the 6WG1 service manual — this Isuzu family typically runs a 0.25–0.45 mm band, but always confirm the exact figure for your build. Tighten the rocker-shaft bracket nuts and bolts progressively in sequence; Isuzu heavy-engine practice is around 27 N·m on the bracket nuts with the large bracket bolt higher (verify against the manual). Torque the lash adjuster locknut properly after setting, otherwise lash will drift and the valve train will rattle. Inspect the pad for wear steps, the bore for ovality and the arm for cracks before reuse; when rebuilding the head, replace the arms as a set with the shaft and adjusting screws.
Price Reference (USD)
The reference price for this Rocker Arm (1126100802) is approximately USD 45 – 90 per unit depending on grade, quantity and shipping destination. This is a planning estimate only — confirm current pricing and availability with our sales team before ordering.
Also in the ARM & ROCKER Series
8973064213, 8973064243, 8980250594.
Racer Machinery is a dedicated construction-machinery parts supplier — we keep the full ARM & ROCKER series in stock and verify every number against your machine before dispatch. Send us your part number and machine model, and we will confirm fitment, price and lead time. Same-family rocker arm part numbers are available on request.
