Bobcat S650 Parts and Maintenance Guide

The Bobcat S650 skid steer loader is one of the most popular mid-frame machines in the Bobcat lineup. Keeping it running reliably depends on following a structured maintenance schedule at 250, 500, and 1,000-hour intervals. Each service milestone has specific Bobcat S650 parts that need inspection or replacement, from engine oil filters at 250 hours to hydraulic fluid and drive components at 1,000 hours.

• Machine type: Mid-frame skid steer loader with vertical lift path, pressurized cab
• Service intervals: 250 hours (filters and fluids), 500 hours (hydraulic filter, fuel filter), 1,000 hours (hydraulic fluid, coolant, drive components)
• Key maintenance parts: Engine oil filter, hydraulic filter, air filters (inner and outer), fuel filter, door glass, drive belt
• Parts availability: Aftermarket S650 parts widely available at 20-60% savings vs. dealer pricing

What Maintenance Schedule Should I Follow for My Bobcat S650?

Bobcat's service manual breaks S650 maintenance into three primary intervals. Following this schedule prevents unplanned downtime and catches wear items before they fail in the field.

Interval	Service Items
Every 250 hours	Engine oil and filter, grease all fittings, check air filter, inspect drive belt, check tire pressure and lug nuts
Every 500 hours	Hydraulic filter, fuel filter, air filter replacement (if needed), coolant level and condition check, battery terminals
Every 1,000 hours	Hydraulic fluid change, engine coolant replacement, drive chain/belt tensioning, pivot pin and bushing inspection, full undercarriage check

 

According to Bobcat's operator manual, daily pre-operation checks should include fluid levels (engine oil, hydraulic, coolant), tire condition, and a walk-around inspection for leaks or visible damage.

What Bobcat S650 Parts Need Replacing at 250 Hours?

The 250-hour service is the most frequent scheduled maintenance event on the S650. It focuses on engine protection and lubrication.

• Engine oil and filter: This is the single most important service item. The S650 uses a spin-on engine oil filter. Change the oil and filter together to maintain clean lubrication
• Grease fittings: The S650 has multiple grease points on the loader arms, pivot pins, and tilt cylinder. Greasing prevents metal-on-metal wear at these high-stress pivot points
• Air filter inspection: Check the outer air filter element. In dusty conditions, the air filter may need cleaning or replacement well before the 500-hour mark. The S650 uses both an inner (safety) and outer (primary) air filter element
• Drive belt check: Inspect the drive belt for cracking, glazing, or fraying. Adjust tension if needed

Many S650 owners combine the 250-hour service with a quick visual inspection of hydraulic hoses, the cab door glass, and the Bob-Tach attachment plate for signs of wear or damage.

What Additional S650 Parts Are Due at 500 Hours?

The 500-hour service adds fuel system and hydraulic filtration to the routine. This is also the recommended interval for replacing the air filter elements if they were not changed earlier.

• Hydraulic filter: The hydraulic filter traps contaminants that circulate through the entire hydraulic system. Bobcat recommends replacement every 500 hours to protect the pump, cylinders, and control valves
• Fuel filter: Prevents contaminated diesel from reaching the fuel injection system. Pre-fill the new filter with clean diesel and prime the fuel system after installation
• Air filter elements: Replace both the outer (primary) and inner (safety) elements if they have not been changed since the last 500-hour service. The inner element should be replaced, not cleaned
• Coolant check: Test the coolant concentration and condition. Top off or flush as needed based on the coolant's age and test results

Our parts specialists recommend ordering a complete filter kit for the 500-hour service. This bundles the engine oil filter, hydraulic filter, fuel filter, and air filters into a single order, saving time and ensuring you have everything on hand. Browse our Bobcat S650 parts collection for filter kits and individual filters.

What Filters Does the Bobcat S650 Use?

The S650 uses five distinct filter types, each protecting a different system. Here is the complete filter list with typical OEM references:

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

 

According to Bobcat's maintenance guidelines, the inner (safety) air filter should never be cleaned and reused. It is a last line of defense for the engine and must be replaced when serviced.

Which S650 Hydraulic Components Need Regular Service?

The S650's vertical lift hydraulic system operates at pressures exceeding 3,000 PSI. Components under that kind of stress require regular inspection and timely replacement.

• Hydraulic hoses: Inspect all hoses for chafing, bulging, cracking, or weeping at fittings. Replace any hose showing signs of deterioration before it fails under pressure
• Cylinder seals: Look for hydraulic fluid weeping around lift and tilt cylinder rods. A thin film of oil on the rod is normal, but dripping indicates seal wear
• Hydraulic fluid: Change the fluid every 1,000 hours or sooner if it appears dark or smells burned. Use the fluid type specified in your operator's manual
• Loader arm pivot pins and bushings: The S650's vertical lift path places specific stress patterns on the loader arm pivots. Grease regularly and replace bushings when play becomes noticeable

From our experience serving equipment owners across North America, hydraulic hose failure is one of the most common unplanned repair events on the S650. Proactive hose inspection during each service interval prevents field breakdowns.

What Door Glass and Cab Parts Does the S650 Need?

The S650 uses the M-series pressurized cab, which shares components with other M-series Bobcat skid steers and compact track loaders. Key cab parts to know:

• Front door glass: OEM part number 7120401 (flat, tempered safety glass). This is the most commonly replaced cab component due to impact damage from flying debris
• Pressurized door seal: OEM 7281063. Inspect during any glass replacement and replace if the rubber is cracked, hardened, or permanently compressed
• Wiper arm: OEM 7251263
• Wiper blade: OEM 7251264

Browse our Bobcat door glass collection for replacement glass and cab components. Because the M-series cab is shared across multiple models, glass and seal availability is excellent.

What Undercarriage and Drive Parts Should I Watch on the S650?

As a wheeled skid steer (not a tracked machine), the S650's undercarriage focuses on tires, wheel hardware, and the drive chain or belt system.

• Tires: Inspect tread depth, sidewall damage, and tire pressure at every service. Skid steers are hard on tires due to the scrubbing action during turns
• Wheel lug nuts: Check torque at every 250-hour service. Vibration can loosen lug nuts over time
• Drive chain/belt: Inspect tension and condition at every service. A loose or worn drive chain causes sluggish response and uneven travel. Adjust or replace per the operator's manual specifications
• Final drive: Check the gear oil level in the final drive housings at each major service interval. Low gear oil leads to premature wear of the planetary gear set

How Do I Find the Right Part Number for My S650?

The most reliable method is using your serial number. The Bobcat S650 skid steer loader has been in production since 2013, and mid-production engineering changes mean that two S650s built in different years may use different part revisions.

1. Locate your serial number plate on the left side of the frame near the rear of the machine
2. Record the full serial number including any prefix letters
3. Look up the number in Bobcat's online parts catalog to identify the correct parts for your production run
4. Cross-reference the OEM part numbers with aftermarket equivalents on our Bobcat S650 parts page

If you cannot find your part or are unsure which revision applies, email sales@partsonline.com with your model and serial number. Our parts team can verify the correct part before you order.

Are Bobcat S650 Parts Interchangeable with Other Models?

The S650 shares many components with other Bobcat skid steers in the same platform family. Understanding which parts cross over can help with availability and pricing.

• S630: The closest sibling. The S630 is the radial-lift version of the same frame size. Many engine, hydraulic, and cab parts are shared between the two models
• S770: One step up in frame size. Some engine filters and cab components overlap, but hydraulic capacity and frame dimensions differ
• T650: The compact track loader equivalent. Shares the same engine platform and many hydraulic components, but the undercarriage is entirely different
• M-series cab: Door glass, seals, wiper components, and cab hardware are shared across the entire M-series cab platform used on multiple skid steers and CTLs

Always verify interchangeability using your serial number. Even within the same model family, serial number breaks can change part specifications. Browse our Bobcat skid steer parts for components that list multiple compatible models.

How Do I Use My Serial Number to Verify S650 Part Fitment?

Your Bobcat S650 serial number is the definitive identifier for your machine's exact parts specification. It accounts for mid-production engineering changes that model number alone does not reveal.

The serial number plate on the S650 is located on the left side of the main frame, near the rear of the machine. It includes:

• Model designation (S650)
• Full serial number (used for parts catalog lookups)
• Manufacturing date information

Enter your serial number into Bobcat's online parts catalog to see the exact parts list for your machine. This eliminates guesswork and ensures you order the correct revision, especially for components like filters, seals, and electrical parts that may have changed during the S650's production run.

Frequently Asked Questions

How many hours can a Bobcat S650 engine last with proper maintenance?

With consistent maintenance at the recommended intervals, Bobcat S650 engines commonly exceed 5,000-8,000 hours before requiring a major overhaul. The key factors are regular oil changes, clean air filtration, and proper coolant maintenance.

Are S650 parts the same as S630 or S770 parts?

The S650 and S630 share many components since they are built on the same frame size. The S770 is a larger frame, so overlap is limited to cab parts and some engine components. Always verify by serial number before assuming interchangeability.

What is the most expensive part to replace on an S650?

The hydraulic pump is typically the highest-cost single component. Routine filter changes and clean hydraulic fluid protect it from premature failure. Drive motors and the engine itself are also high-value components that benefit from preventive maintenance.

Can I use aftermarket parts on my S650 without voiding anything?

Aftermarket parts that meet or exceed OEM specifications can be used on your S650. The Magnuson-Moss Warranty Act prevents manufacturers from requiring OEM-only parts for warranty coverage, provided the aftermarket part meets the necessary specifications.

Where is the serial number located on a Bobcat S650?

The serial number plate is on the left side of the main frame near the rear of the machine. You may need to lower the loader arms to access it comfortably.

What are the most common S650 problems reported by owners?

Based on our catalog data, the most frequently ordered S650 parts include door glass (impact damage), hydraulic hoses (chafing and age), engine filters, and Bob-Tach components. These reflect the most common maintenance and repair needs for this model.

How often should I grease my S650?

Bobcat recommends greasing all fittings every 10 operating hours for machines in normal conditions, and every 8 hours in severe conditions (dusty, wet, or high-load environments). This protects loader arm pivots, cylinder pins, and Bob-Tach components.

What is the S650's rated operating capacity?

The Bobcat S650 skid steer loader has a rated operating capacity of 2,690 lbs with a vertical lift path. This positions it as a mid-frame machine suitable for a wide range of construction, landscaping, and agricultural applications.