144-0103 Contactor — Overview
144-0103 is a heavy-duty contactor that switches the high-current supply in the starting and main power circuit of construction machinery. It is supplied as a genuine-format replacement built to match the original contact rating and coil specification, so it drops into the existing bracket and wiring without rework.
Applicable Machine Families
This contactor is a typical fit for Caterpillar medium and large excavator and loader electrical systems, commonly associated with the 300-series machine platform. Because coil voltage and contact size vary between builds, confirm the marked specs against your original unit before ordering.
Maintenance & Inspection
Inspect the contact faces for pitting, burns or carbon build-up, and check the coil insulation and the arc chamber for cracks. A contactor that chatters, arcs excessively or runs hot is usually at the end of its life and should be replaced rather than overhauled.
Installation Notes
- Switch off and disconnect the battery before working.
- Verify coil voltage (AC/DC) and rated contact current against your circuit.
- Tighten main and coil terminals to spec and do a manual make/break test.
- Seal the housing against moisture after reconnection.
Reference Price
Reference price: approximately USD 9 – 55 per unit (estimate, subject to configuration and quantity). Confirm final pricing with our sales team.
Available Part Numbers
- 144-0103
Also in the Contact & Control Series
Same-series, real numbers we also supply (always confirm fit and interchange against your machine): 348-6693, 4617012, 424-0338, 2136947, and more
Planning to order this part? Send us the part number together with your machine model and serial number, and the Racer Machinery team will confirm the exact configuration and current availability before you commit.
