عجلة مشط التبن 298-2877 2982877 لـ حفارة صغيرة Caterpillar 303 303.5 304

303 303.5 304 Control Valve Assy for Excavator spare parts 298‑2877 2982877 Distributor Aftermarket

Product Overview

The CAT 303, 303.5 and 304 are Caterpillar's micro excavators — 3‑to‑4 ton machines that fit through a garden gate and dig a footing without touching the fence. For contractors running these, the distributor is the component that turns the machine into a precision tool: it takes the pump's small flow and meters it to boom, arm, bucket, swing and tracks, so an operator can work centimetres from a foundation or lift a pipe into a trench without incident.

On a worked micro CAT, valve wear shows up as the machine losing its manners. The boom drifts down while holding a bucket, the swing jerks and overshoots, the tracks surge when an attachment is cycled, and the machine crabs on slopes instead of tracking straight. Inside the block, worn spools and scored bores are letting oil bleed across circuits. This aftermarket distributor, referenced as 298‑2877, replaces the whole assembly with fresh internals, set to the correct Caterpillar pressures for each model, so the old block comes off and the new one bolts straight back on.

Core Advantages

1. One reference across three micro models
The distributor family spans the 303, 303.5 and 304, so contractors running more than one size can stock a single reference. Send the serial number and we supply the block for your machine.

2. Centimetre‑level control returns to the operator
Micro work is all about finesse. Lapped spools restore the fine response that lets an operator work against a foundation or beside a fence without the jumpy feel of a worn valve.

3. The boom holds its position while the operator checks
Drift under a held bucket is oil escaping past worn spool lands. Fresh spool‑and‑bore pairs hold pressure, so the bucket stays where the lever left it through an idle.

4. Swing that does not disturb the surroundings
Scored bores make the house jerky — overshoot, then a hunt back. New internals restore clean rotation, essential in the confined spaces these machines work in.

5. A complete block for a machine that earns in a day
Re‑spooling a worn micro valve on the bench is fiddly work. Swapping in this tested assembly is one clean exchange with the same hose positions — a day's job on a machine that pays for itself quickly.

Manufacturing & Quality Control

Spool and bore pairs are finished to close clearance and run‑in on the bench to confirm free movement without stick‑slip. Each completed valve is flow‑tested across its circuits, with relief and compensator settings logged before acceptance; anything off spec is stripped and reworked. The finished block is oil‑fogged, port‑plugged and shipped on compact cushioned packing.

Frequently Asked Questions

Q1: Which part number suits my machine?
A: Read the tag on your existing valve against 298‑2877 and send the machine serial number. The reference spans the 303 family, so we confirm the correct block before dispatch.

Q2: Does this valve fit all three models?
A: The platform is shared, but port fittings and relief tuning differ per model. Send the serial number and we supply the block matched to your specific machine.

Q3: What symptoms point to a worn distributor?
A: Boom drift, jerky or overshooting swing, tracks that surge when attachments are cycled, and poor straight‑line tracking on slopes. A leak test will confirm before you buy.

Q4: Can my existing valve be repaired?
A: Often yes — if the block casting is sound, a re‑spool and seal kit can restore it. Send photos and we will advise honestly on repair versus replacement.

Q5: Can this be shipped by express courier?
A: Yes — a micro valve this size ships well by air or express, often faster and cheaper than sea freight for a single unit. Tell us the destination and we will quote the fastest option.

Q6: What voids the warranty?
A: Materials and build defects are covered. Damage from contaminated oil, water ingress, a seized spool forced into movement or incorrect pressure adjustment is excluded. Photograph any arrival damage before uncrating.