12V Starter Motor 6670727 for Bobcat 325 E35 – Service Part

Fleet Stocking — 12V starter motor for Bobcat compact excavators kept available across multiple production runs, ensuring older machines past dealer support still receive matched electrical spares.

Technical Specifications

Application Suitability

When Reactive Procurement Becomes the Fleet’s Biggest Cost

A starter motor is one of the most predictable wear items on a compact excavator, yet most fleets treat it as a surprise failure.

The typical progression is slow enough to plan around but fast enough to catch unprepared operators off guard. Cranking speed declines over weeks, intermittent engagement events multiply, and then the machine fails to start on a cold morning at the job site. In mining camps and remote construction locations, that single no-start event idles not just the excavator but the crew and trucks waiting on it. [NEED_CITE: predictive maintenance scheduling for mobile equipment electrical systems]

Fleet owners who budget starter replacements based on operating hours consistently see lower cumulative downtime than those who wait for failure. The difference is particularly pronounced for compact excavators in high-utilization roles where each hour of unscheduled downtime carries compounding cost through the entire work chain.

Where the Starter Motor Sits in the Machine’s Service Life

This Starter Motor maintenance service part for Bobcat excavator fits into the electrical system refresh cycle that every compact excavator eventually requires. Unlike hydraulic pumps that may be rebuilt multiple times, starter motors are typically replaced as complete assemblies once brush wear and solenoid contact degradation pass the point of economical repair. For Bobcat E-series and legacy 300-series machines now past the period of strong dealer support, having a verified aftermarket replacement on the shelf means the difference between a scheduled Saturday swap and a Monday morning emergency.

Reading the Warning Signs Before Total Failure

The wear progression in a 12V 2.2KW starter follows a recognizable pattern across compact excavators in similar duty cycles. Operators report progressively slower cranking, particularly on cold starts, followed by occasional no-engagement events where the solenoid clicks but the pinion does not mesh with the flywheel ring gear. [NEED_CITE: electrical system fault diagnosis for compact construction equipment] Once these symptoms appear, remaining service life is measured in weeks rather than months. For fleet managers tracking multiple Bobcat units, logging these warning signs against operating hours builds a replacement schedule that keeps machines running and avoids reactive procurement entirely.

How 10-Tooth CW Engagement Defines Fitment Across Generations

The 10-tooth pinion with clockwise rotation is the physical interface between this starter and the engine flywheel. Bobcat compact excavators from the 325 through the E55 share this engagement specification, though production run variations mean that confirming the tooth count and rotation direction against the machine serial number eliminates fitment surprises. The 2.2KW output rating matches the cranking load requirements of the diesel engines in these machines under typical ambient conditions. Higher-output alternatives exist for extreme cold-climate applications, but for standard construction and mining environments, matching the original power specification ensures proper ring gear engagement without excessive wear. [NEED_CITE: starter motor torque specifications for compact diesel engines]

The Cumulative Cost of Waiting for Failure

Replacing a starter motor only after a no-start event means the machine has already cost the fleet an unplanned downtime window. In a mining operation or remote construction site, that window extends beyond the repair itself to include the lost production of every machine in the work chain that depended on the excavator. Fleets that stock one spare starter per several machines and swap at the first consistent warning sign avoid this compounding loss entirely. The part cost is minor relative to a single day of idle equipment and crew. [NEED_CITE: total cost of ownership analysis for fleet electrical components]

Why Procurement Consolidation Matters for Lifecycle Spares

Sourcing this starter motor from a supplier that also covers the adjacent electrical and engine auxiliary components means a fleet’s entire preventive maintenance order ships as one consignment. XUNPO maintains stock in Guangzhou for fast dispatch on common items and identifies parts from number, machine model, photograph, or nameplate image. Cross-reference verification covers superseded and alternate numbers across Bobcat production runs. Sample supply allows fitment confirmation before committing to fleet-level quantities. The technical team confirms compatibility and grade for each machine serial variant in the fleet. One account and one warranty cover both self-produced and sourced lines.

Documentation & Verification

• Commercial invoice and packing list referencing 6670727 cross-reference numbers for customs clearance
• Part compatibility sheet confirming fitment against Bobcat E-series and 300-series serial ranges
• Quality inspection record documenting voltage, rotation, and tooth count verification
• Warranty terms covering 3-12 months with stated claim process
• Packing photographs showing starter motor protection before container loading
• HS code and customs documentation support for electrical starting equipment

Service Interval & Stocking Guidance

• Replace starter motor at first consistent slow-cranking symptom, typically between 2,000 and 3,000 hours
• Inspect 10-tooth pinion and solenoid contacts during every major electrical system service
• Stock one spare 12V 2.2KW starter per five machines in high-utilization fleet operations
• Store replacement starters in dry, temperature-stable conditions to preserve brush and bearing condition
• Bundle starter replacement with battery cable and ground path inspection for complete circuit verification

Planning Your Fleet’s Next Electrical Refresh

Provide your Bobcat machine models, serial numbers, and current operating hours to receive replacement interval recommendations and stocking quantity guidance. Including your fleet’s typical duty cycle and operating environment helps calibrate the suggested service intervals for your specific conditions.

Frequently Asked Questions

Q: How often should a starter motor be replaced on a compact excavator in typical duty cycles?
A: In standard construction and mining duty cycles, starter motors on compact excavators typically require replacement between 2,000 and 3,000 operating hours. The exact interval depends on start frequency per shift, ambient temperature, and battery condition. Logging cranking speed degradation against hours allows each fleet to establish its own baseline for proactive replacement.

Q: What warning signs indicate the starter is nearing end of service life?
A: Progressive slow cranking, particularly on cold starts, followed by intermittent solenoid engagement events where the motor clicks but does not turn the engine. These symptoms indicate brush wear and solenoid contact degradation. Once they appear consistently, remaining service life is limited and planned replacement should be scheduled immediately.

Q: Should I replace just the starter or inspect the broader starting circuit at the same time?
A: Replacing the starter without inspecting battery cables, ground connections, and the ignition switch risks installing a new component into a degraded circuit. A complete circuit review during starter replacement identifies voltage drop issues that would shorten the new unit’s service life and cause premature return of starting problems.

Q: How many spare starters should a fleet keep on hand?
A: For high-utilization fleets operating multiple Bobcat compact excavators in similar duty cycles, one spare starter per five machines provides adequate coverage. This ratio balances inventory cost against the risk of unplanned downtime, particularly in remote locations where emergency procurement carries extended lead times.

Q: Can I still get starter motors for older Bobcat 300-series excavators?
A: Aftermarket supply for legacy Bobcat 300-series machines remains available through verified cross-reference numbers. Identifying the correct variant requires confirming machine serial number and production run, as superseded part numbers and variant differences exist across the 325 through 341 range. Cross-reference verification ensures accurate fitment before dispatch.