ناقل الحركة النهائي 151-5108 لـ حفارة Caterpillar 315B

315B Final Drive for CAT Excavator spare parts 151‑5108 155‑0157 1515108 1550157 Axial Piston Motor

Product Overview

The Caterpillar 315B is the machine that built its reputation on flexibility: a 15‑ton frame that fits on a standard trailer, rotates fast for truck loading, and still has the dig depth to take on utility trenches and residential footings. Under each track sits the axial piston motor and planetary reducer — references 151‑5108, 155‑0157, 1515108 and 1550157 — that turns pump flow into the low‑speed, high‑torque rotation driving the sprocket. On a 15‑ton CAT that has clocked real hours, the drive rarely fails all at once. It announces itself gradually: the two tracks stop quite matching, the machine pulls a shade off line on level ground, the drive housing warms faster than its opposite after a run, and a faint whine or growl builds inside the track frame. The temptation is to keep working until a track actually stops pulling — but by then the piston group, cylinder block and reduction gears are already scoring debris through the oil, and the damage is spreading through the whole travel circuit. This aftermarket final drive reproduces the original motor‑and‑reducer pairing as one sealed, bench‑tested assembly, so the worn unit comes off as a complete piece and the new one bolts straight back on with no mid‑job sourcing.

Core Advantages

1. A piston group that holds pressure under real load
The cylinder block, piston shoes and valve plate are lapped to tight running clearances, so hydraulic pressure does not leak internally through the motor. That is what keeps both tracks pulling evenly — no crab‑walk, no slow side, no hesitation the instant the bucket loads the machine.

2. Hardened reduction gears built for daily reversing
The planetary gear set uses case‑hardened, precision‑cut gears with controlled backlash. Smooth meshing spreads drive torque across the tooth flanks rather than hammering a few teeth, which is why the reducer stays quiet and durable through years of trench pushing and ramp climbs.

3. Sealed out of the mud and silt
Trenching and utility work expose the drive to standing water, fine silt and quarry dust. Correct output‑shaft and housing seals keep that grit out of the motor and gear oil — the single most common reason compact CAT drives fail early, and the thing this build gets right.

4. One complete, tested unit means a faster repair
Motor and reducer arrive pre‑assembled and bench‑checked for torque, leakage and noise. The fitter unbolts the old drive and bolts on the new one without matching separate components — a real saving when a 15‑ton machine that earns by the hour is parked.

5. Aftermarket build value for a well‑used B‑series machine
Original Caterpillar final drive exchange units carry a premium that is hard to justify on an older 315B. This unit restores track mobility at a fraction of that cost, with sample supply and batch pricing for workshops running several of these machines.

Manufacturing & Quality Control

Every drive is built under controlled production: incoming steel is certified, housings and gears are precision‑machined to drawing tolerances, wear surfaces are case‑hardened, and assembly happens in a clean area. Before packing, each unit runs on a test rig to verify output torque, internal leakage and running noise; anything outside acceptance limits is rejected. Completed drives are preservation‑coated, moisture‑sealed and shock‑crated for sea and overland freight, so they arrive ready to install rather than arriving rusted or loose.

Frequently Asked Questions

Q1: How do I know which reference matches my machine?
A: Read the tag on your existing final drive and match it against 151‑5108 or 155‑0157 (the non‑dash numbers are the same part). Send us your machine serial number and we confirm before dispatch — B‑series build variants can differ.

Q2: Does this arrive as the complete drive?
A: Yes — the listing is the full axial piston motor and planetary reducer as one bolt‑on assembly. If you only need the motor cartridge or the gearbox internals, ask and we will check what is available.

Q3: What should a fitter check after installation?
A: Confirm the mounting bolts are torqued to spec, refill the travel circuit to the correct oil level, bleed air from the motor, and run a slow no‑load track test before working under full load. Follow the Caterpillar service manual for bleeding procedure.

Q4: What is covered under warranty?
A: Manufacturing and material defects are covered. Damage from contaminated oil, debris entering the motor, track obstruction, forcing a failed drive, overload or incorrect installation is excluded. If a drive fails on arrival, photograph it and contact us before stripping it down.