Bobcat E50 Parts and Service Guide

The Bobcat E50 is a 5-ton class mini excavator with a zero tail swing design, powered by a Yanmar diesel engine. Following the manufacturer's maintenance intervals at 250, 500, and 1,000 hours protects your investment and prevents costly unplanned downtime. This guide covers every Bobcat E50 parts category you need for scheduled service, from filters and fluids to ground engagement components that wear with every dig cycle.

The Essentials

• Machine class: 5-ton mini excavator, zero tail swing, Yanmar diesel engine
• Service intervals: 250 hours (oil and filters), 500 hours (hydraulic and fuel filters), 1,000 hours (fluid changes, undercarriage and pin/bushing inspection)
• Key maintenance parts: Engine oil filter, hydraulic filter, fuel filter, air filters, bucket teeth, pins and bushings
• Ground engagement wear items: Bucket teeth and cutting edges wear fastest and need the most frequent inspection

What Maintenance Schedule Should I Follow for My Bobcat E50?

The E50's maintenance schedule follows a structured interval system. Excavators have unique service demands compared to skid steers and CTLs because of the constant hydraulic cycling involved in boom, arm, and bucket operation.

Interval	Service Items
Daily	Check fluid levels, grease boom and arm pins, inspect bucket teeth, check tracks for debris
Every 250 hours	Engine oil and filter, grease all fittings, inspect air filter, check track tension, inspect hydraulic hoses
Every 500 hours	Hydraulic filter, fuel filter, air filter replacement, pin and bushing inspection, roller and idler check
Every 1,000 hours	Hydraulic fluid change, coolant replacement, full undercarriage assessment, all cylinder seal inspection, swing bearing grease

According to Bobcat's operator manual, daily greasing of the boom, arm, and bucket pins is critical on mini excavators. These pivot points cycle hundreds of times per hour during digging, and inadequate lubrication leads to rapid bushing wear and costly pin replacement.

What Bobcat E50 Parts Need Replacing at 250 Hours?

The 250-hour service is the foundation of E50 maintenance. It focuses on engine protection and the high-wear pivot points unique to excavators:

• Engine oil and filter: The Yanmar diesel engine requires clean oil to maintain performance. Change both the oil and spin-on filter at every 250-hour interval
• Grease all fittings: The E50 has more grease points than a skid steer because of the boom, arm, bucket, and swing mechanism. Every pivot pin needs greasing at this interval (daily greasing is recommended for the hardest-working pins)
• Air filter inspection: Excavators work in dirt. The outer air filter element may need cleaning or replacement well before the 500-hour mark, especially during trenching or demolition work
• Track tension check: Mini excavator tracks operate in varying soil conditions. Check tension and adjust as needed
• Hydraulic hose inspection: Look for chafing where hoses route along the boom and arm. Hoses on excavators flex constantly during operation

What Additional E50 Service Items Are Due at 500 and 1,000 Hours?

At 500 hours:

• Hydraulic filter: The E50's hydraulic system cycles constantly during digging, placing high demand on filtration. Replace on schedule to protect the pump and cylinders
• Fuel filter: Pre-fill the new filter with clean diesel and prime the system after installation
• Air filter elements: Replace both inner (safety) and outer (primary) elements
• Pin and bushing inspection: Check all pivot pins for play. Measure bushing wear against service limits. Excessive play in boom or arm bushings reduces digging accuracy and accelerates further wear
• Roller and idler check: Inspect for bearing noise, seal leaks, and wobble

At 1,000 hours:

• Hydraulic fluid change: Replace the full volume with the specification listed in the manual
• Coolant replacement: Flush and refill the cooling system
• Full undercarriage assessment: Measure track, roller, idler, and sprocket wear
• Cylinder seal inspection: Check every hydraulic cylinder (boom, arm, bucket, blade, swing) for seal weeping or leaks
• Swing bearing grease: The turret swing bearing needs grease at extended intervals. Check your manual for the specification

Browse our Bobcat E50 parts collection for filters, seal kits, and maintenance components.

What Filters Does the Bobcat E50 Use?

The E50 uses a suite of filters similar to other Bobcat machines, with specifications matched to its Yanmar diesel engine:

Filter Type	Purpose	Change Interval
Engine oil filter	Removes contaminants from engine oil	Every 250 hours
Hydraulic filter	Protects pump and cylinders from contamination	Every 500 hours
Fuel filter	Prevents contaminated diesel from reaching injectors	Every 500 hours
Outer air filter (primary)	First-stage intake air filtration	Every 500 hours (sooner in dust)
Inner air filter (safety)	Backup filtration if outer element fails	Every other outer filter change

The E50's Yanmar engine uses different filter specifications than the engines in Bobcat skid steers and CTLs. Do not assume filter interchangeability between machine types. Always verify by model and serial number.

What Bucket Teeth and Ground Engagement Parts Does the E50 Need?

Ground engagement parts wear faster than any other component on a mini excavator because they contact soil, rock, and debris with every dig cycle. For the E50, these include:

• Bucket teeth: The tips of the digging bucket. They are replaceable wear items designed to be swapped out when worn down. Inspect teeth daily for breakage and wear
• Cutting edge: The bottom edge of the bucket behind the teeth. Provides the primary digging surface. Replace when worn to the bolt holes
• Side cutters: Protect the sides of the bucket from wear. Replace when noticeably thinner than new
• Tooth pins and retainers: Hold the teeth in place. Check for looseness or wear during daily inspections

Tooth replacement frequency depends entirely on the material being dug. Sandy soil causes minimal wear, while rocky ground and compacted clay can wear through a set of teeth in a fraction of the time. Rotating teeth before they are fully worn extends the life of the bucket itself.

From our experience serving equipment owners across North America, keeping a spare set of bucket teeth on hand prevents downtime when a tooth breaks or wears out mid-job.

Which E50 Hydraulic Components Need Regular Service?

The E50's hydraulic system works harder than most because excavator hydraulics cycle constantly during digging. The boom, arm, bucket, swing, and blade all run on the same hydraulic pump.

• Hydraulic hoses: Inspect all hoses, especially where they route along the boom and arm. Flexion at the boom-to-arm joint is a common chafe point
• Cylinder seals: The E50 has multiple hydraulic cylinders (boom, arm, bucket, blade, and swing). Check each for oil weeping around the rod. Seal kits are available for all E50 cylinders
• Hydraulic pump: Listen for cavitation or whining noise. Changes in pump sound often indicate filter restriction or internal wear
• Swing motor: The turret swing mechanism uses a dedicated hydraulic motor. Check for leaks and smooth operation during each service

Neglecting hydraulic maintenance on an excavator leads to faster and more expensive failures than on a skid steer because the hydraulic system is under constant, cyclic load during digging operations.

What Undercarriage Parts Should I Monitor on My E50?

Like all tracked machines, the E50's undercarriage is a significant maintenance area. Mini excavator undercarriage components include:

• Rubber tracks: Inspect tread depth and check for cracking, exposed cords, or missing tread chunks. Track life varies from 1,000 to 2,000 hours depending on terrain
• Drive sprockets: Worn teeth cause the track to slip. Inspect for uneven wear patterns
• Front idlers: Check for wobble, bearing noise, and seal leaks
• Bottom rollers: Support the machine's weight. Listen for bearing noise during travel
• Track tension adjuster: Verify proper tension at every 500-hour service. Excavators working in clay or sticky soils may need more frequent tension adjustments as material packs in the undercarriage

Browse our Bobcat mini excavator parts for undercarriage components and track hardware.

What Cab and Glass Parts Does the E50 Use?

The E50's cab design differs from the M-series cabs used on Bobcat skid steers and CTLs. Do not assume cross-compatibility with skid steer cab parts.

• Door glass and windows: Excavator cab glass is specific to the E-series. Verify the correct part number using your serial number
• Cab seals: Check seals around windows and doors for deterioration that allows dust and water intrusion
• Wiper components: Front wiper arm and blade. Replace the blade when streaking becomes visible

For E50 cab glass and components, contact sales@partsonline.com with your serial number for the correct part identification.

Are E50 Parts Interchangeable with E42 or E55 Parts?

The E50 shares some components with other E-series mini excavators, particularly those using the same Yanmar engine platform:

• E42: One step smaller. Some engine filters and electrical components may cross over, but hydraulic capacity and undercarriage dimensions differ
• E55: One step larger. Similar overlap in engine components and some hydraulic parts, but boom and arm dimensions are different
• Bucket teeth: Ground engagement parts may interchange between similar-sized excavators if the tooth mounting system is the same. Verify tooth style and pin diameter before assuming compatibility

The E50's zero tail swing design means its turret and counterweight configuration is specific to this model. Cab-related parts and turret components are generally not interchangeable with conventional tail swing models.

How Do I Find the Right E50 Part Number Using My Serial Number?

The serial number plate on E-series mini excavators is located on the right side of the machine near the base of the boom arm. This location differs from skid steers and CTLs, where the plate is on the left side of the frame.

1. Locate the serial number plate on the right side near the boom arm base
2. Record the full serial number
3. Enter it into Bobcat's online parts catalog for the exact parts list
4. Cross-reference OEM numbers with aftermarket equivalents on our Bobcat E50 parts page

If you are unsure about any part, email sales@partsonline.com with your model and serial number. Our team can verify fitment before you order.

Frequently Asked Questions

How many hours should a Bobcat E50 engine last?

The Yanmar diesel engine in the E50 is designed for thousands of hours of operation with proper maintenance. Consistent oil changes, clean air filtration, and proper coolant maintenance are the primary factors in engine longevity.

What track types are available for the E50?

The E50 uses rubber tracks in its specified width and pitch. Options include standard tread for general use and block tread for better traction in soft conditions. Verify the track width, pitch, and link count against the OEM specification.

Are E50 bucket teeth universal or model-specific?

Bucket teeth come in different styles and mounting systems. The E50 uses a specific tooth style that may be shared with other similar-sized mini excavators, but you must verify the tooth style and retainer pin diameter. Not all mini excavator teeth are interchangeable.

What hydraulic oil does the Bobcat E50 use?

Consult your operator's manual for the exact hydraulic fluid specification and capacity. Using the correct viscosity is important for proper system operation, especially in cold weather.

Can I use aftermarket pins and bushings on my E50?

Yes. Aftermarket pins and bushings manufactured to OEM specifications provide equivalent performance. The critical dimensions are pin diameter, bushing bore, and overall length. Verify these measurements against the OEM specification for your serial number.

Where is the serial number on a Bobcat E50?

On E-series mini excavators, the serial number plate is on the right side of the machine near the base of the boom arm. This differs from skid steers and CTLs where it is on the left frame rail.

How often should I grease my E50's boom and arm pins?

Bobcat recommends daily greasing of the boom, arm, and bucket pins on mini excavators. These pivot points cycle hundreds of times per hour during digging. In high-production applications (continuous digging, demolition), greasing every 4-8 operating hours is recommended.

What is the E50's digging depth?

The Bobcat E50 mini excavator has a maximum digging depth of approximately 12 feet (varies slightly by configuration). Its zero tail swing design allows it to work close to walls and structures without the tail swinging beyond the track width.