OEM 800138363 The XCMG Starter Motor Relay (NTA-855-C400) 800138363 is a genuine OEM relay engineered to switch the high starting current that cranks the engine on XCMG hydraulic excavators.
Identified by part number 800138363, this factory-built relay carries the heavy current between the battery, ignition switch, and starter motor.
It is assembled with copper contacts, a sealed coil, and a heat-resistant housing that keeps switching reliable in dusty and vibrating engine bays.
Exact OEM terminal layout, mounting pattern, and coil rating allow a direct plug-and-bolt replacement without rewiring or adapter harnesses.
By delivering clean, full-voltage switching, this starter motor relay supports fast cranking and protects the ignition circuit from overload.
The 800138363 Starter Motor Relay uses silver-alloy faced copper contacts that resist arcing and pitting during repeated engine cranking.
A sealed coil winding resists moisture, dust, and oil vapour, so the relay pulls in reliably even in wet or dirty engine compartments.
The heat-resistant housing keeps its shape and insulation strength when the relay sits close to hot exhaust or turbo components.
Exact OEM terminal positions let the original harness connectors snap on without splicing, which shortens diagnosis and repair time.
Full-voltage switching delivers strong cranking current, so the starter spins fast and the engine catches quickly in cold weather.
By handling the high current away from the ignition switch, this relay protects wiring and key contacts from burning and pitting.
The ignition switch sends a small control current to the relay coil, which creates a magnetic field that closes the heavy-duty contacts.
Once closed, the contacts pass battery voltage directly to the starter solenoid, so the starter pinion engages and cranks the engine.
This two-stage arrangement means thin control wires carry only a few amps, while the relay handles the hundreds of amps the starter needs.
The genuine 800138363 is calibrated to pull in at the correct voltage, so the starter engages firmly without chatter or delayed cranking.
Correct contact pressure also reduces voltage drop, which keeps cranking speed high and shortens the time the starter motor runs.
Production begins with certified copper, silver-alloy, and insulation materials checked for conductivity, hardness, and heat resistance.
Coil winding is done on calibrated machines so turn count and resistance stay within the XCMG specification for every relay.
Contact assembly is performed under controlled pressure to guarantee the gap, wipe, and closing force that determine long electrical life.
Finished relays are sealed and then tested for pull-in voltage, drop-out voltage, contact resistance, and insulation resistance.
Batch records allow XCMG to trace each 800138363 relay back to its coil and contact lots, so any quality issue is resolved quickly.
The 800138363 relay installs with standard hand tools, keeping labour time and downtime low during scheduled electrical service.
Disconnect the battery negative cable first, then isolate the main starter feed before touching any terminal on the relay.
Label the control and power wires, remove the mounting bolts, and lift the old relay out of its bracket.
Fit the new relay on the bracket, reconnect the terminals to the original positions, and tighten the mounting bolts to the manual torque.
Reconnect the battery, turn the key, and confirm the starter cranks immediately without clicking, chatter, or delayed engagement.
During routine maintenance, check terminals for corrosion and tightness, and replace any relay that clicks without cranking.
Every 800138363 relay is produced in an ISO 9001 and ISO 14001 certified plant with traceability from raw materials to packed carton.
Incoming copper and insulation are tested for conductivity and heat resistance, and finished relays are checked for coil resistance.
During production, contact gap, closing force, and terminal position are measured at set intervals against the XCMG drawing.
Post-production checks include pull-in and drop-out voltage tests, contact resistance measurement, and insulation resistance testing.
Sample relays from each batch undergo vibration, thermal cycling, and high-cycle endurance tests to confirm field durability.
Low-cost aftermarket relays often use thin contacts and weak coils that click without cranking, or fail after a few months of service.
The genuine 800138363 is built to exacting XCMG standards, giving correct coil rating, reliable switching, and long electrical life.
Its sealed housing and accurate terminal layout reduce the chance of corrosion, voltage drop, and unexpected no-start downtime.
Genuine XCMG parts also preserve warranty coverage, protect resale value, and stay compatible with other OEM components.
Backed by XCMG global quality standards and technical support, this starter motor relay delivers dependable starting in tough conditions.
Choosing the genuine 800138363 relay prevents a simple no-start fault from turning into an expensive starter or harness repair.
A failing relay can cause repeated cranking attempts that overheat the starter, drain the battery, and burn ignition switch contacts.
Durable contacts and proper sealing keep switching performance consistent across a long service life, reducing replacement frequency.
Reliable starting also extends battery and starter motor life, lowering the total cost of ownership for fleet operators.
Fleet records from construction and mining operations show genuine XCMG electrical parts cut no-start downtime noticeably.
XCMG applies sustainable manufacturing to the 800138363 relay through recyclable copper and steel content and efficient processes.
The long service life of the relay reduces material waste and lowers the environmental footprint of replacement parts over time.
Reliable starting reduces unnecessary cranking, which saves fuel and lowers exhaust emissions on active construction sites.
Electrical materials in this component comply with RoHS and REACH rules for safe handling and responsible disposal.
The 800138363 Starter Motor Relay is stocked in XCMG regional distribution centres across North America, Europe, Asia, and Australia.
Each relay is bagged and packed in a sturdy carton that shields it from dust, moisture, and impact during transport and storage.
For fleet-wide orders, XCMG provides volume pricing and consolidated freight options that simplify planning and reduce cost.
Real-time stock visibility and dedicated supply chain support help fill urgent requests quickly, shortening downtime on active projects.
Robust packaging preserves factory condition until installation, preventing terminal damage and housing cracks common in stored spares.
The XCMG 800138363 Starter Motor Relay is a vital electrical component for XCMG excavators, switching starter current reliably in demanding conditions.
Its silver-alloy contacts, sealed coil, and heat-resistant housing deliver dependable cranking performance in hot, wet, and dusty environments.
By preventing no-start faults and protecting the starting circuit, this relay reduces downtime, lowers maintenance costs, and extends machine service life.
Always purchase genuine XCMG parts from authorised dealers to guarantee authenticity, quality, and performance for your equipment fleet.
Choose the 800138363 Starter Motor Relay for dependable starting and lasting operational peace of mind.
Partner with XCMG, your trusted source for heavy equipment engine and hydraulic components that deliver real value.
OEM 800138363 – XCMG Starter Motor Relay (NTA-855-C400) – the definitive engine starting relay solution for your excavator starting circuit. Engineered for durability, designed for exact fitment, and backed by global quality standards. Trust the original to protect your investment and maximise uptime.
