excavator travel motor final drive replacement 20 ton

Quick Answer HPV102 is the Hitachi main-pump model used across the ZX200 / ZX210 / ZX230 / ZX270 class — but the model name alone will not get you the right pump, because the series comes in several variants (HPV102, HPV102GW, HPV102FW) and sits in a specific generation of Hitachi's line-up. It was introduced with the EX200-5 / EX220-5 and the early ZAXIS machines; the earlier generation use...

Quick Answer MSF340 is a KYB (Kayaba) travel motor — also called a final drive motor — in the 340 size class, built for large excavators in the 60–90 tonne range. It is a dual-speed piston-type motor with a built-in parking brake, which is why it turns up on so many big machines. The short model name tells you the family and size; the exact fitment is decided by the machine's own...

Quick Answer Five questions, five short answers — each is explained in full below.1. What is the A8VO107? It is a Rexroth designation for a bent-axis, variable-displacement axial-piston double pump of roughly 107 cc/rev per section, fitted as the main pump on the CAT 320B. The "8" family is Rexroth's double (twin) bent-axis version.2. Bent-axis vs swash-plate? In a bent-axis pump the cylinde...

Quick Answer 1. What is the A20VLO260? It is a manufacturer-style designation for the 374D's main pump — an axial-piston, variable-displacement pump of roughly the 260 cc/rev class. Read it in two parts: the letter-and-number prefix identifies the pump family and design, and the trailing 260 is the displacement class. On a mining machine this size, displacement is measured in hundreds of cc ...

Quick Answer Travel that is weak or noisy on an EX1200-6 is a symptom, not a diagnosis. Work in three stages:1. Separate hydraulic from mechanical. Is one track affected or both? Both points to the supply side — pumps, travel control, reliefs, centre joint. One points to that travel unit or its circuit.2. Decide gearbox or complete device. The travel device (9270013-class assembly: 9270013 /...

Quick Answer Reviving an older Komatsu like the PC128UU-1 is usually the right economic decision — the machine is paid for, and it still does the work. The hard part is not the machine; it is finding the right pump without being sold the wrong one.On old machines, three things make selection harder than on a new one: part numbers get superseded, listings cross-reference numbers loosely, and ...

Quick Answer The Hitachi ZX850-3 / ZX870-3 travel device is the complete final drive that moves the machine — hydraulic motor, parking brake and planetary reduction in one unit. It is listed under the travel device number 9251681, and its own lubricant is listed under 4636857. The assembly weighs about 1,200 kg and packs in a 100 × 100 × 70 cm case.There are two things worth unde...

Quick Answer The CAT 320GC uses the A28VO130 hydraulic pump group, listed under five order numbers — 489-3483, 531-9885, 567-9721, 593-8367 and 655-8833. It weighs about 190 kg and packs in a 77 × 67 × 75 cm case.Here is the money-saving principle in one line: on this machine, most "pump problems" are not pump problems. The 320GC uses an electronically controlled pump with intell...