cat 320gx final drive

Quick Answer The CAT 336 / 340 main hydraulic pump is a two-section variable-displacement axial-piston pump, supplied under two Cat order numbers — 568-3006 and 568-3007. Both belong to the same machine family, but they are not automatically interchangeable: what decides the correct one is your machine's build and serial, and above all the input spline. This pump is offered with a 13-tooth (...

Quick Answer The CAT 320D3 swing drive is ordered at three levels, and they are not alternatives to each other — they are three layers of the same assembly. 525-3741 is the complete swing device, 524-2647 is the swing motor, and 543-1000 is the swing reduction gearbox on its own (in fact 543-1000 sits inside 525-3741). That structure decides your whole purchase: you cannot choose a number un...

Quick Answer The main pump on a Caterpillar 336F is a variable-displacement axial-piston pump — Cat catalogues this unit as 377-4950, a "2P Series Hydraulic Pump", and the trade knows it as the SBS180. It does one job: turn engine rotation into hydraulic flow and pressure, and then vary that output continuously so the machine gets exactly the flow the operator is asking for. Understanding ho...

Quick Answer When a SANY SY500 travels slowly on one side only, the symptom itself is the most useful clue you have: it rules out everything that serves both tracks. The fault must be in one track's circuit or one track's final drive. The decisive test is simple and costs nothing — swap the travel hoses left to right. If the slow side follows the hoses, the problem is hydraulic (relief, cont...

Quick Answer You should replace the final drive gearbox on a CAT 320 GX when the reduction has damage that cannot be cleaned out or re-set: metal or silver sheen in the oil, a grinding or knocking noise that has been getting worse, oil loss you cannot stop, or a unit that runs noticeably hotter than the other side. Before you buy, prove two things — that the fault is inside the gearbox and n...

Quick Answer Your CAT 312C needs the SBS80 because that is the pump size matched to a machine of this class. A 12 to 13 tonne excavator has a moderate engine and a moderate flow demand, and the pump has to sit exactly between the two: too large and the engine lugs and burns fuel; too small and the functions starve under load. The SBS80 is the twin axial-piston main pump built for that balance, del...

Quick Answer A CAT 320C or 320D pump loses power under heavy load for one fundamental reason: internal leakage grows as pressure rises. At light load the wear is invisible — the pump simply strokes a little further and the machine feels normal. Put the bucket into hard ground, pressure climbs, more oil escapes past worn plungers and valve plates instead of reaching the actuators, and the mac...

Quick Answer Customers buy a TM40 travel assembly for one of two reasons: a travel drive has failed or is failing, or a fleet owner wants to standardise on one drive across machines of several brands. The TM40 is a cross-brand final drive for 18 to 25 tonne excavators — Hyundai R210-7, Doosan DX225, Volvo EC210B, and Chinese machines from Sany, XCMG and LiuGong. It does three jobs: turn hydr...