Bobcat 743B Parts Diagram & Specs: Complete Guide for Fast, Accurate Ordering

Key Takeaways

This guide is for Bobcat 743B owners, operators, and mechanics looking to identify, understand, and order replacement parts using accurate diagrams. If you’re searching for a Bobcat 743B parts diagram to help with maintenance or repairs, you’re in the right place. Understanding how to read and use the Bobcat 743B parts diagram is essential for efficient maintenance, troubleshooting, and repairs—helping you avoid costly mistakes, reduce downtime, and ensure your machine stays productive.

 

• The 743B was produced in the late 1980s through the early 1990s, and using the correct serial number range is critical when reading diagrams and choosing parts.
• Main systems covered include engine, hydraulics, drive train, loader frame, and operator cab—each with their own typical wear parts that appear in dedicated diagram sections.
• Core 743B specs like horsepower (34-36 hp), operating weight (4,810-5,000 lbs), and lift capacity (1,300-1,350 lbs) help you confirm you have the correct model before ordering.
• Diagrams use exploded views with numbered callouts linking to parts lists that include OEM part numbers, descriptions, quantities, and notes about superseded items.
• The FAQ at the end answers common questions on where to find diagrams, how to cross-reference OEM numbers, and when to choose OEM vs aftermarket parts.

 

Where to Find Bobcat 743B Parts Diagrams

The official Bobcat 743B parts catalog includes detailed diagrams and illustrations of all major components. These are available for purchase online in PDF or print format. The catalog is the most reliable source for accurate, up-to-date diagrams and part numbers, making it an essential tool for anyone maintaining or repairing a 743B.

 

Overview of the Bobcat 743B Skid Steer Loader

The Bobcat 743B is a classic skid steer that’s earned its place on construction sites, family farms, and landscaping operations across the country. Built tough and designed for simplicity, these machines keep working decades after they rolled off the production line.

 

The 743B is an updated version of the original Bobcat 743 skid steer loader, built around the late 1980s through the early 1990s. Bobcat refined the hydraulics, controls, and durability features to address wear issues seen in earlier 743 units. You’ll still find these loaders on small job sites and family farms where compact power and easy repairs matter more than the latest electronics.

 

The Bobcat 743B parts catalog includes detailed diagrams and illustrations of various components. This article focuses on understanding the 743B parts diagram—not general operation or safety procedures. It’s written in clear, straightforward language so you can quickly find what you need.

 

Using an accurate parts diagram helps you avoid ordering wrong components, reduce downtime, and keep older 743B units productive. Throughout this guide, we’ll use examples drawn from real 743B systems: Kubota V1702 engine components, drive chains, hydraulic hoses, and loader linkage.

Bobcat 743B Specifications (For Confirming Your Model)

Before relying on any parts diagram or ordering parts, confirm you actually own a 743B—not a 743, 743DS, or Bobcat 753 skid steer. The model number and specifications tell you which diagrams apply to your machine.

 

Engine Specifications

• Kubota V1702 diesel engine (some units use V1720)
• 4-cylinder, liquid-cooled
• Approximately 34-36 gross horsepower at 2800 RPM
• Displacement of 105.7 cubic inches (1.7 liters)
• Compression ratio of 21:1
• Peak torque around 80 ft-lb at 1600 RPM
• 23-gallon diesel fuel tank capacity

 

Operating Specifications

• Typical operating weight ranges from 4,810-5,000 lbs depending on tire options and counterweights
• Rated operating capacity of approximately 1,300-1,350 lbs at 50% tipping load
• Tipping load around 2,600 lbs
• Lift breakout force of 2,749 lbs
• Tilt breakout force of 2,798 lbs
• Maximum travel speed of 6.0 mph

 

Dimensions Relavant to Parts and Attachments

• Overall height of 75.8 inches
• Overall width with standard tires about 55-58 inches
• Overall length of 120.4 inches
• Ground clearance of 7.5 inches
• Bucket hinge pin height of 109.0 inches
• Dump height of 86.3 inches

 

These specifications matter for parts because they help you match attachments to the correct quick-tach size, choose the right tires and wheels, and ensure hydraulic components are sized correctly for the 743B’s 11 GPM system at roughly 3000 PSI.

 

Serial Numbers and How They Affect Parts Diagrams

Bobcat used different serial number breaks on 743 and 743B machines. Diagrams in the parts manual and parts catalog are organized around those breaks. This means a part that fits one serial range may not fit another, even on the same model.

 

Where to Find Serial Numbers

Location	What You’ll Find
Inside left upright above rear grill	Loader serial number on data plate
Flat pad on engine block	Engine serial number stamping

Many Bobcat online and PDF diagrams specify ranges like “S/N 5011-0001 & Above” or “Up to S/N 999999.” Internal changes—like different hydraulic pump versions, chain case details, or fuel injection components—are tied to those ranges.

 

Always match your serial number range before using a parts diagram from Fab Heavy Parts or any OEM catalog. This is especially important for engines, drive components, and hydraulic parts where mid-production updates changed mounting configurations or seal specifications.

 

How to Read a Bobcat 743B Parts Diagram

A parts diagram is a detailed illustration showing the components of a machine, with numbered callouts that correspond to a parts list. The Bobcat 743B parts catalog includes these diagrams for all major systems, making it an essential reference for maintenance and repairs.

 

Most 743B diagrams are exploded views. They show every component in a system with numbered callouts that link to a parts list. Once you understand the format, you can quickly find any part in the machine.

 

Typical Diagram Page Structure

A standard page has the exploded view on one side and a parts list on the other. The parts list includes columns for:

• Item number (matches the callout number on the drawing)
• Part number (OEM 7-digit code like 6561726)
• Part name/description
• Quantity per assembly
• Notes (such as serial range restrictions or supersession info)

 

How to Use the Diagram

1. Find the item number on the exploded drawing.
2. Match it to the same number in the parts list.
3. Note the OEM part number and description.
4. Search that number on Fab Heavy Parts or request a quote.

 

Common Symbols and Notes

Symbol/Note	Meaning
NLA	No Longer Available from OEM
Superseded by [number]	Part replaced by newer number
S/N range notation	Part only fits certain serial ranges
Dashed lines	Optional parts or alternate configurations
Arrows	Assembly direction or installation orientation

 

Recommended Workflow

1. Confirm your loader serial number and engine serial number.
2. Open the correct section of the diagram (engine, chain case, hydraulics, etc.).
3. Locate the failed or worn component in the exploded view.
4. Record the item number, OEM part number, and description.
5. Cross-reference with Fab Heavy Parts for pricing and availability.

 

Keep in mind that diagrams don’t always show wear patterns or hose routing details. Physical comparison with the part on your machine helps confirm you’ve identified the right item.

 

Main Sections of a Bobcat 743B Parts Diagram

The full 743B parts book divides into major systems. Each system has multiple pages of diagrams. This section walks through the key groups owners reference most often.

 

Primary Diagram Sections

• Engine and Fuel System – Covers the Kubota diesel, cylinder head, fuel tank, injection pump, filters, and related components
• Cooling System – Includes radiator, fan, belts, water pump, hoses, and thermostat
• Hydraulic System – Contains pump, control valve, lift/tilt cylinders, reservoir, filters, and all hoses
• Drive Train and Chain Case – Shows hydrostatic motors, chains, sprockets, bearings, seals, and wheel hubs
• Electrical System – Covers starter, alternator, lights, switches, and wiring components
• Loader Frame and Linkage – Includes lift arms, pivots, bushings, pins, and Bob-Tach plate
• Operator Cab and Controls – Shows ROPS, seat, pedals, levers, and safety interlocks
• Standard Wear Parts – Lists tires, filters, belts, and other service items

 

While OEM manuals sometimes use slightly different headings, these categories cover how most owners think about the machine when troubleshooting or ordering parts. The following sections drill into each major system, showing how diagrams are typically laid out and which common 743B parts Fab Heavy Parts can supply.

 

Engine & Fuel System Diagram (Kubota V1702 on 743B)

Engine Diagram Layout

The Kubota V1702 diesel on the 743B is a 4-cylinder, liquid-cooled engine producing around 34-36 horsepower. It uses mechanical fuel injection and a simple fuel system well suited for field repair. The engine’s straightforward design is one reason these loaders remain serviceable after 30+ years.

 

The engine section usually includes exploded views for:

• Long block assembly (cylinder head, valves, pistons, rings)
• Front gear train
• Oil pump and oil pan
• Intake and exhaust manifolds
• Engine mounting brackets

 

Fuel System Sub-Diagrams

Component	Common Part Numbers to Note
Fuel tank and sending unit	Tank shape varies by year
Lift pump (if equipped)	Check serial range
Fuel filter base and element	Often 6698772 or similar
Injection pump	Serial-specific
Injectors	Match to engine model
Return lines	Confirm fitting sizes

 

Common Engine Parts

• Head gasket sets
• Piston and ring kits
• Glow plugs and glow plug relays
• Water pumps and thermostats
• Fuel filters
• Complete rebuild kits

 

Differences between 743 and 743B engines—and between serial ranges—mean you should rely on diagrams specific to “743B” and confirm engine model stamping before ordering internal engine components. A Kubota V1702 may have different seals or gaskets than a V1720, and complete drop-in options such as a new Kubota D722 engine assembly follow the same principle of matching specs to your application.

 

Cooling System Diagram

Cooling Diagram Components

The 743B cooling system diagram focuses on the radiator, fan, belts, water pump, hoses, and coolant recovery bottle. These components are easy to visualize in exploded drawings and straightforward to service.

 

The diagram shows the radiator core, side channels, mounting bolts, fan shroud, fan blade, pulley, and belt layout. Each piece is numbered and tied back to the parts list.

 

Upper and lower radiator hoses, hose clamps, thermostat housing, and temperature sender or switch appear as distinct items. The coolant overflow tank and cap are also separately numbered.

 

Common Cooling Parts to Order

• Radiators (aftermarket brass-core options available for longevity)
• Fan belts (confirm exact length for your serial range)
• Fan hubs and blades
• Thermostat and gasket
• Radiator caps
• Upper and lower hoses with clamps

 

Some diagrams show optional cold-weather or high-debris cooling packages. Compare your physical machine—check for extra shrouds or debris screens—to the drawing to pick the right version. Dusty environments are hard on 743B radiators, making regular cleaning and inspection essential.

 

Hydraulic System Diagram

Diagram Organization

On the 743B, the hydraulic system runs the lift arms, bucket tilt, and auxiliary hydraulics for attachments. The hydraulic diagram pages are some of the busiest in the parts book because of the number of hoses, fittings, and components involved.

 

The hydraulic section usually breaks into separate pages:

• Main hydraulic pump (gear-type, mounted to engine)
• Control valve stack
• Lift and tilt cylinders
• Hydraulic oil reservoir (11-gallon capacity)
• Filters (main and return)
• Hoses and steel lines with routing information

 

Each hose assembly has a unique item number on the diagram. The parts list shows the corresponding part number, length, fitting size, and sometimes routing notes like clamp locations.

 

Common Hydraulic Wear Parts

Part Type	Notes
Cylinder seal kits	Typically 2-3” bore for lift/tilt
Main hydraulic filter elements	Often 10-micron
Return line filters	Check filter base compatibility
Hose assemblies	Can be custom-built if NLA
Quick couplers	Match to attachment interface
O-ring kits	Various sizes for valve stack

 

Fab Heavy Parts can often build or source custom hydraulic hoses if the original part number has been superseded or is listed as discontinued in the OEM diagram notes. The 743B’s system runs at approximately 3000 PSI, so replacement hoses must match that pressure rating.

 

Drive Train & Chain Case Diagram

Drive Train Diagram Layout

The 743B uses chain-driven wheels powered by hydrostatic drive motors. The motors feed sprockets inside sealed chain cases on each side of the loader. This system is reliable but requires periodic attention to chains, seals, and lubricant.

 

The diagrams typically show:

• Final drive motors
• Drive sprockets (typically 23-25 teeth)
• Roller chains (#80 or #100 pitch, usually 92-96 links)
• Idlers, bearings, and seals
• Chain case housing and drain plugs
• Wheel hubs, axle studs, and associated hardware

 

Common Drive Components to Search For

• Drive chains (confirm pitch and link count)
• Sprockets (left and right specific—don’t mix)
• Axle seals and bearings
• Chain case gasket or RTV kits
• Wheel studs and nuts

 

Pay close attention to notes in the diagrams about chain pitch, sprocket tooth counts, and left vs right-hand parts. Ordering by description alone can lead to mistakes without the diagram’s detail. Mismatched chain pitch will chew up sprockets quickly.

 

Oil leaks at the hubs usually signal seal wear. Noisy operation often indicates chain stretch or worn sprockets. The diagram helps you identify exactly which seals and bearings to order before disassembly.

 

Loader Frame, Lift Arms & Attachment Interface Diagram

Diagram Breakdown

 

The 743B’s loader frame, lift arms, and quick-attach plate are represented in detailed parts diagrams. Bushings, pins, and wear pads are clearly numbered so you can identify exactly what needs replacement.

 

The diagrams show the main boom arms, cross members, pivot points, and linkages between the tilt cylinder and bucket. Quick-tach (Bob-Tach) components appear as a distinct assembly.

 

Pins, pivot bushings, link plates, and bucket cylinders are individually called out. This makes it simple to see which parts are responsible for excessive play or uneven bucket movement.

 

Frequent Wear Parts in This Area

• Boom bushings (bronze or steel, typically 1.5-2” diameter)
• Loader arm pins
• Bucket tilt cylinder pins
• Side plates and wear pads in the quick-attach
• Hardware kits

 

Fab Heavy Parts stocks or sources replacements to restore tight, accurate loader movement, supported by their wider range of industrial parts and maintenance accessories. Greaseable bushings can significantly extend service life beyond the 5,000-hour mark.

 

Attachment diagrams—buckets, pallet forks, augers—are usually in separate sections but share the same quick-attach interface. The standard Bob-Tach interface on the 743B is around 45-48 inches wide. Confirm your loader uses the standard Bobcat pattern before buying new attachments or ordering skid steer attachments and components.

 

Operator Cab, Controls & Safety Components Diagram

Cab Diagram Contents

The 743B cab and controls diagram covers the ROPS/FOPS structure, seat and seat bar, foot pedals, hand controls, and safety interlock components. These parts protect the operator and must function correctly.

 

The cab diagram shows the cab shell, windshield or front door (if equipped), hinges, latches, gas struts, and mounting hardware. Glass, frames, and seals have separate numbers in the parts list.

 

There’s usually a specific diagram for the seat bar restraint system and related pedals. It shows springs, pivot pins, link rods, and locking mechanisms. This is useful when the safety bar no longer locks the pedals correctly—a common issue on high-hour machines.

 

Common Cab and Control Parts

• Replacement seats
• Seat belts
• Seat bar components
• Pedal return springs
• Joystick or lever boots
• Safety switches (prone to failure from corrosion)

 

Use the diagrams not just for ordering, but also for understanding how the safety systems link together. This helps ensure correct reassembly after repairs. A safety switch that’s wired wrong can prevent the machine from starting or create unsafe operation conditions.

 

Electrical System Diagram

Electrical Component Diagrams

While wiring schematics differ from exploded parts diagrams, the parts book still shows physical electrical components in exploded views. These include the starter, alternator, battery cables, lights, and switches.

 

The diagrams depict the starter motor assembly with mounting bolts, solenoid, and sometimes separate serviceable parts. The alternator appears with brackets, pulleys, and belt routing.

 

Lights (front work lights and rear lights), ignition switch, key, fuses, and basic harness segments often have their own pages or sub-assemblies. This helps you identify the exact style and mounting for your serial range.

 

Common Electrical Parts 743B Owners Order

Component	Notes
Starters	12V, solenoid-integrated
Alternators	Typically 15-20 amp
Glow plug relays	Common cold-start failure point
Ignition switches	Match key pattern
Headlight assemblies	Confirm mounting style
Main battery cables	Corrosion causes starting issues

For complex wiring issues, consult both the wiring diagram (schematic) in a service manual and the exploded parts diagram. This way you can see both electrical paths and physical mounting locations. Starting problems are often traced to corroded cables or bad grounds rather than component failure.

 

Routine Service & Wear Parts in the 743B Diagrams

The easiest way to keep a Bobcat 743B running is to stay ahead on routine service. The parts diagram clearly labels every filter, belt, and serviceable fluid component. Your maintenance manual and operation and maintenance manual recommend intervals—use the diagrams to identify exact part numbers, just as you would when sourcing Hino J08E engine service parts or components for other power units in your fleet.

 

Key Service Items

Service Item	Diagram Section
Engine oil filter	Engine section
Fuel filter	Fuel system section
Hydraulic filter	Hydraulic section
Air cleaner element	Air intake section
Fan belts	Cooling system section

 

Other Routine Wear Items

• Tires (10-16.5 standard)
• Wheel nuts
• Grease fittings (zerks)
• Drive belts

 

Using Fab Heavy Parts with Your 743B Parts Diagram

At Fab Heavy Parts, we understand that owners and fleet managers running older Bobcat 743B loaders need practical, no-nonsense support. You don’t have time for guesswork or waiting weeks for backordered parts.

 

How to Order with Confidence

1. Locate the needed OEM part numbers in your 743B diagram (PDF or book).
2. Enter those numbers into the search function on www.fabheavyparts.com.
3. Or send them by email or phone for cross-reference help.

 

FAQ

Q1: Where can I get a Bobcat 743B parts diagram if I don't have the original book?

A1: You have several realistic options. You can purchase a genuine or used parts manual from equipment documentation sellers. Many vendors offer PDF versions you can download and click through digitally—this is often the most convenient format for zooming in on detail areas. If you only have partial information, Fab Heavy Parts can use internal references based on your serial number and photos to help locate correct parts that match original diagrams. While we cannot reproduce Bobcat’s entire document, we can guide you to the right components. Store digital copies of any diagrams you buy. This lets you quickly reference them when ordering parts without hunting for a physical book.

 

Q2: What if the part number in my 743B diagram shows as "superseded" or "NLA"?

A2: “Superseded” means the part has a newer replacement number—Bobcat updated the design or consolidated part numbers. “NLA” or “No Longer Available” means the original OEM part is not sold new anymore. Bring either the original or superseding number to Fab Heavy Parts. We can usually cross-reference it to a current aftermarket or OEM-equivalent part. Our suppliers maintain databases that track these changes. When multiple replacements exist, ask about quality differences. For example, HD seals or heavy-duty chains may work better in demanding conditions than standard replacements.

 

Q3: Can I safely mix OEM Bobcat parts with aftermarket parts on my 743B?

A3: In most cases, mixing OEM and high-quality aftermarket parts is safe if the aftermarket parts meet or exceed original specifications and are designed specifically for the 743B. Keep matched sets for critical components. Pairs of drive chains or opposing hydraulic cylinders should match to maintain balanced performance. Using one worn chain with one new chain creates uneven pull. Fab Heavy Parts focuses on parts built to OEM standards so they integrate smoothly with factory components already on your machine.

 

Q4: How do I know if a Bobcat 743 diagram is correct for my 743B model?

A4: Check both the model designation and the serial number range printed on the diagram or manual cover. The “743” and “743B” have differences that affect parts compatibility—refined hydraulics, updated chain case seals, and control improvements distinguish the 743B. If the diagram only lists “743” without a “B,” or if the serial ranges don’t match your loader tag, verify with Fab Heavy Parts before ordering major components. Compare key physical features in the drawing (engine layout, controls, chain case design) with what’s actually on your machine to spot obvious mismatches.

 

Q5: What information should I have ready before I contact Fab Heavy Parts for 743B parts?

A5: Gather these essentials before reaching out:

• Bobcat 743B model confirmation
• Loader serial number from the data plate
• Engine model and serial number if available
• Part numbers from your diagram
• Clear photos of worn or broken parts

 

Having this information ready allows our team to cross-reference quickly, confirm compatibility, and reduce the chance of ordering incorrect items. Consider keeping a small notebook or digital file with your most commonly ordered part numbers for faster repeat orders.

 

Recommended Replacement Parts for Bobcat 743B

1.

V1702 Engine Overhaul Rebuild Kit For Kubota L1850 L2850 Aftermarket Replacement For Bobcat 733 743B

Fits engine: V1702

Application: The Engine Overhaul Rebuild Kit fits for Kubota L1850F, L2850, L2850DT, L2850T, L2860GST, L1850DT; Bobcat 733, 743DS, 743, 1600, 743B; Genie Z45/22

Contents: Piston: 1 set, Cylinder liner: 1 set, Piston pin: 1 set, Piston ring: 1 set, Piston snap: 1 set, Piston pin bush: 1 set, Con rod bearing: 1 set, Main bearing: 1 set, Full gasket kit: 1 set, Valve guide: 1 set, Intake valve: 1 set, Exhaust valve: 1 set, Intake valve seat: 1 set, Exhaust valve seat: 1 set, Thrust washer: 1 set

 

2.

Aftermarket Replacement For Bobcat Skid Steer Loader 645 743 743B 743DS Radiator 6648820

Part Number: 6648820

Application: The Radiator is Aftermarket Replacement For Bobcat Skid Steer Loader:645, 743, 743B, 743DS

Core Height Between Tanks: 30-1/4"

Core Width Fin Area Only: 11-1/2"

Inlet Neck: 1-1/4"

Outlet Neck: 1-1/4"

Rows: 4

This radiator provides essential cooling for your skid steer loader. Its efficient design includes two heat exchangers and a CPU radiator, making it perfect for engine’s cooling system. Built to the highest standards, it’s sure to effectively keep your engine temperature stable.

 

3.

Manifold 6598132 Aftermarket Replacement For Bobcat Loader 743 743B 1600

Part Number: 6598132

Condition: new, aftermarket

Applications: The Manifold is Aftermarket Replacement For Bobcat Loader: 743, 743B, 1600

 

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