Bobcat 331 Specs and Parts: Dig Depth, Weight, HP

The Bobcat 331 stayed in production for roughly 17 years, from 1993 to 2010, which is why so many are still digging today. The core specs: a 40 horsepower diesel (34 to 40 hp depending on the year), an operating weight of 7,185 lbs, a maximum digging depth of 10.18 feet, and ground-level reach of over 19 feet.

The Essentials

• Machine type: compact (mini) excavator
• Engine: 40 hp diesel (34 to 40 hp across the production run)
• Operating weight: 7,185 lbs
• Max dig depth: 10.18 ft (122.1 in)
• Production run: 1993 to 2010, including 331E and 331G updates

What Are the Bobcat 331 Specs?

The 331 anchored Bobcat's compact excavator line for nearly two decades, and its specification sheet explains the appeal: real digging numbers in a package that tows behind a one-ton truck. Figures below are drawn from RitchieSpecs and period Bobcat documentation.

Specification	Bobcat 331
Engine	4-cylinder diesel, 40 hp gross (34 to 40 hp by year), 2,200 cc
Operating weight	7,185 lbs
Max digging depth	10.18 ft (122.1 in)
Max reach at ground	19.19 ft
Max cutting height	14.9 ft
Travel speed	up to 3.2 mph
Hydraulic pump capacity	24.1 gpm
Fuel capacity	15.3 gal
Shipping length	16.02 ft
Shipping height	7.74 ft
Track width	5.05 ft outside of tracks
Tail swing radius	4.56 ft
Standard bucket	0.17 cu yd class

How Deep Can a Bobcat 331 Dig?

10.18 feet at maximum, which covers the jobs this class of machine actually gets hired for: water and sewer laterals, footings, drainage, and stump work. Pair that with 19.19 feet of reach at ground level and a 14.9 foot cutting height, and the working envelope is generous for a machine that fits through a standard gate width with room to spare.

Real-world depth depends on bucket choice and spoil placement. A narrower trenching bucket reaches full depth more efficiently than a wide grading bucket, which is worth remembering when your trench spec sits near the machine's limit.

How Much Can a Bobcat 331 Excavator Lift?

Lift capacity on an excavator is a chart, not a single number: it varies with boom position, swing angle, and whether the load is over the blade or over the side. The over-blade, close-in figures are the strongest; over-side at full reach is the weakest.

For planning purposes, the 331 handles typical trench boxes, pipe sections, and landscape boulders within its class, with the lift chart in the Bobcat operation and maintenance manual giving the exact figure for each configuration. Never exceed the chart; tipping a conventional-tail-swing excavator over the side is the classic avoidable accident. Consult a certified operator or mechanic if the machine's lift behavior does not match the chart, as that points to hydraulic wear.

What Is the Difference Between the Bobcat 331 and 334?

The 334 is the larger sibling on the same platform: more operating weight and deeper digging, aimed at buyers who wanted extra capability without stepping up a full size class. The two machines share design DNA and era, which is why they get cross-shopped in every used listing search.

For parts purposes, treat them as related but distinct: many wear items differ between the models, and the correct reference is always your machine's serial number rather than the family resemblance.

Bobcat 331 vs 331E vs 331G: Which One Do You Have?

Bobcat updated the 331 twice across its long run, and the year-specific searches we see (1998, 1999, 2003, 2004, 2007 specs) are really variant questions in disguise:

• 331: the original configuration from the 1993 launch
• 331E: the mid-cycle update of the platform
• 331G: the final-generation update, carrying the model to the end of production in 2010

Engine output moved within the 34 to 40 hp band across these updates, and detail parts changed with each revision. The serial number decodes which variant you own; our guide to finding the serial number on your Bobcat mini excavator shows the plate location and how to read it.

Is the Bobcat 331 Reliable?

Its 17-year production run is the strongest evidence: machines that disappoint get replaced, not refined twice. Owners rate the 331 as a dependable digger with conventional, serviceable systems and none of the emissions complexity of current machines.

Reliability at this age is really about the previous owner. Prioritize machines with documented hydraulic service, clean undercarriage wear, and an engine that starts crisply cold. A tired 331 telegraphs its condition quickly in the first ten minutes of digging.

How Much Is a Bobcat 331?

Used pricing spans a wide band driven by hours, variant, and undercarriage condition, with late 331G machines at the top of the range. Auction results and dealer listings are the current benchmark worth checking for your region.

When comparing candidates, price the undercarriage separately in your head: tracks, rollers, idlers, and sprockets are the big-ticket wear system on any mini excavator, and their condition can swing the real cost of two identically priced machines by thousands.

What Are Common Bobcat 331 Problems?

The 331's wear patterns are conventional mini excavator wear patterns, which is good news for parts availability:

• Undercarriage wear: the largest ongoing cost on any tracked machine of this age
• Hydraulic seep and drift: cylinder seals and hoses age out; drift on the boom or dipper means reseal time
• Slow hydraulics: filters and fluid condition first, pump diagnosis second
• Cooling system fatigue: plugged cores behind most overheating complaints
• Cab glass and door hardware: standard attrition on working machines

All of these map to stocked categories in Bobcat 331 parts, with the broader Bobcat mini excavator parts catalog covering mixed fleets.

Are Bobcat 331 Parts Still Available?

Yes. A 17-year production run created a deep installed base, and the aftermarket serves it thoroughly: filters, seals, glass, and wear parts remain in active production, meeting or exceeding OEM specifications at a saving over dealer pricing. Our catalog lists over 200 parts with Bobcat 331 fitment, cross-referenced from Bobcat OEM part numbers.

Which Maintenance Parts Does a Bobcat 331 Need?

Based on our catalog data for the 331 family, the steady consumables are exactly what the service schedule predicts:

• Filter sets: engine oil, fuel, air, and hydraulic filters at manual intervals
• Hydraulic seals: cylinder seal kits as drift appears
• Cab glass: door and side glass replacements after site incidents
• Pins and bushings: bucket and linkage wear on high-hour machines

It is the customer's responsibility to verify part compatibility before purchasing, and the 331's three variants make that verification genuinely matter. Email sales@partsonline.com with your serial number and our parts specialists will confirm exact fitment before you order.

Frequently Asked Questions

How much is a Bobcat 331?

Used prices vary widely with hours, variant, and especially undercarriage condition. Check current auction results and dealer listings, and price undercarriage wear into any comparison.

Is the Bobcat 331 reliable?

Yes, its 17-year production run and owner reputation back that up. Condition and service history matter more than the badge at this age.

What is the difference between Bobcat 331 and 334?

The 334 is the larger sibling on the same platform, with more weight and dig depth. Parts differ between them, so order by serial number rather than family resemblance.

How much can a Bobcat 331 excavator lift?

It depends on boom position and whether the load is over the blade or the side; the lift chart in the operation and maintenance manual gives the exact figure per configuration.

What years was the Bobcat 331 made?

1993 to 2010, across the original 331, the 331E update, and the final 331G generation.

What are common Bobcat 331 problems?

Undercarriage wear, hydraulic seal drift, tired filters, and cooling fatigue lead the list. All are standard wear items with readily available aftermarket parts.

Whether you run an original 331 or a late 331G, start with Bobcat 331 parts, or send your serial number to sales@partsonline.com for fitment confirmation before ordering.