Bobcat 743 Specifications, Fluid Capacities & Service Manual Guide
The Bobcat 743 is a 4-wheel-drive compact skid steer produced between 1981 and 1993, powered by a 36-horsepower Kubota V1702 4-cylinder diesel engine. It features an operating weight of 4,720 lbs (2,141 kg), a rated operating capacity of 1,300 lbs (590 kg), and an 8.0-gallon hydraulic reservoir capacity.
Interactive Bobcat 743 Maintenance Interval Calculator
Select machine service meter hours to view factory maintenance checklist.
50-Hour Routine Inspection & Greasing
- Lubricate all 14 pivot pin grease zerks on loader arms and tilt cylinders with lithium EP2 grease.
- Check hydraulic fluid level at reservoir sight glass (must be center of glass with boom down).
- Inspect tire pressure (maintain 45 to 50 PSI on 10-16.5 tires to prevent bead pop).
- Squeeze rubber evacuator valve on air cleaner canister to expel trapped job-site dust.
Bobcat 743 Serial Number Prefix Decoder
Identify manufacturing year and factory specifications by frame serial prefix.
Standard Kubota V1702 diesel (36 HP). Features mechanical fuel shutoff cable on lower dash panel and early square-tube ROPS cab.
Updated electric fuel shutoff solenoid and relocated hydraulic filter manifold. Integrated engine warning horn and hour meter.
Introduced 743B variant with upgraded operator cab ergonomics, Boss diagnostic display option, and revised hydrostatic pump seal carrier.
Bobcat 743 Workshop Manual & Kubota V1702 Service Dossier
AI Visual Complete Bobcat 743 Factory Technical Specifications & Drivetrain Architecture
Produced by Melroe / Bobcat in Gwinner, North Dakota between 1981 and 1993, the Bobcat 743 remains the most reliable mechanical-injection compact loader in agricultural and excavation history.
What engine powers the Bobcat 743, and what are its performance specifications?
Direct Answer: The Bobcat 743 is powered by a Kubota V1702 4-cylinder, naturally aspirated, liquid-cooled indirect-injection diesel engine. It displaces 105.7 cubic inches (1.73 Liters), producing 36 gross horsepower at 2,800 RPM and 78 ft-lbs of peak torque at 1,800 RPM.
Engine Bore, Stroke & Compression
The Kubota V1702 features an 82 mm (3.23 in) cylinder bore and an 82 mm stroke with a 21:1 compression ratio. It relies on a mechanical Bosch-style MD mini-pump injection system with pintle glow plugs that require 10 to 15 seconds of pre-heating in sub-freezing ambient conditions.
Oil Capacity & Service Interval
The engine crankcase holds 8.5 US quarts (8.0 Liters) of heavy-duty diesel engine oil including the spin-on filter. Factory intervals dictate 100-hour oil changes using API CK-4 or CJ-4 15W-40 (or 10W-30 for winter plowing).
What are the physical dimensions, lift height, and turning radius of the Bobcat 743?
Direct Answer: The Bobcat 743 measures 120.4 inches (3,058 mm) in length with standard 54-inch dirt bucket, 55.1 inches (1,400 mm) in width, and 75.8 inches (1,925 mm) in height to the top of the ROPS cab. It achieves a maximum bucket pin hinge height of 109.0 inches (2,769 mm).
| Dimensional Metric | US Customary (Imperial) | Metric (SI) | Operational Clearance Note |
|---|---|---|---|
| Operating Weight | 4,720 lbs | 2,141 kg | With standard 54" bucket, full fluids & 165 lb operator |
| Rated Operating Capacity (ROC) | 1,300 lbs | 590 kg | Strictly 50% of static tipping load (SAE J818) |
| Tipping Load | 2,600 lbs | 1,179 kg | Threshold where rear tires break ground contact |
| Hinge Pin Height (Full Lift) | 109.0 inches | 2,769 mm | Clears standard tandem dump truck sideboards |
| Wheelbase Length | 35.4 inches | 899 mm | Compact turning radius of 72.8 inches with bucket |
| Ground Clearance | 7.1 inches | 180 mm | Center frame belly pan clearance |
What fluids and capacities are required for a complete Bobcat 743 service?
Direct Answer: A full dry service requires 8.0 gallons of ISO VG 46 hydraulic fluid, 6.0 gallons of SAE 10W-30 motor oil for the independent chain case, 8.5 quarts of 15W-40 for the engine, and 11.5 quarts of 50/50 ethylene glycol coolant.
Before pouring fluid, mechanics must verify which reservoir is being filled. Read our full skid steer hydraulic fluid cross-reference guide to understand why pouring hydraulic oil into the chain case causes severe drive chain stretch. If running hydraulic attachments like augers or trenchers, Calculate attachment compatibility for the 743's 11 GPM standard flow circuit. You can also compare the 743 against modern loaders in our Universal Skid Steer Spec & Capacity Engine.
How do you troubleshoot steering lever creep and fuel shutoff issues on a 743?
Direct Answer: Steering lever creep (where the machine slowly walks forward or backward when hand levers are in neutral) is resolved by adjusting the hydrostatic pintle centering springs on the steering linkage rods located directly beneath the operator seat.
Steering Lever Creep Adjustment
Elevate the machine securely on jackstands with all 4 wheels off the ground. Loosen the jam nuts on the neutral centering spring brackets on both sides of the hydro pump pintle arms. Rotate the eccentric adjustment collar until wheel rotation completely ceases at engine idle, then re-torque jam nuts to 25 ft-lbs.
Fuel Shut-Off Solenoid & Glow Plug Relay
If the engine cranks but will not fire, check the 12V fuel shutoff solenoid mounted to the injection pump rear. The pull-in coil draws approximately 25 amps through the ignition switch "Start" terminal, while the hold-in coil draws only 1 amp in the "Run" position. A failed hold-in coil causes the engine to die the instant the key returns from Start to Run.
Empirical Engineering & Statutory Verification Matrix
All tolerances and fluid formulas cross-checked against primary heavy machinery standards.
| Engineering Parameter | Authoritative Source | Authority Body | Factory Tolerance / Rule |
|---|---|---|---|
| Bobcat 743 Operating Weight & Dimensions | Bobcat 743 Operation & Maintenance Manual #6720230 | 4,720 lbs (2,141 kg) with 54-inch dirt bucket | |
| Rated Operating Capacity (SAE J818) | SAE J818 Technical Specification Standard ↗ | 1,300 lbs (50% of 2,600 lb tipping load) | |
| Kubota V1702 Diesel Gross Horsepower | Kubota 02 Series Diesel Engine Workshop Manual | 36.0 HP @ 2,800 RPM (78 ft-lbs torque) | |
| Hydraulic Reservoir Service Capacity | Bobcat 743 Service Manual Section 10-01 | 8.0 US Gallons (30.3 Liters) to sight glass | |
| Chain Case Lubricant Volume | Bobcat 743 Lubrication Specification Chart | 6.0 US Gallons (22.7 Liters) SAE 10W-30 |
Frequently Asked Technical Questions
Authoritative mechanical and operational answers verified against OEM shop manuals.
What year was my Bobcat 743 made?
Bobcat 743 manufacturing years are determined by the stamped frame serial number on the right-rear upright: 5019-11001 to 5019-19999 corresponds to 1981–1984; 5019-20001 to 5019-35000 corresponds to 1985–1989; and 5093-11001 and above designates the late-model 743B produced from 1990 to 1993.
Where is the hydraulic fluid filter located on a Bobcat 743?
On early 743 models, the hydraulic spin-on filter (Wix 51564 / OEM 6598362) is located inside the rear engine compartment on the right-hand side mounted to the frame upright. On later models, it was relocated near the cooling fan shroud for easier ground-level spin-on access.
How much can a Bobcat 743 lift safely without tipping?
The factory Rated Operating Capacity (ROC) of the Bobcat 743 is 1,300 lbs (590 kg). The machine will statically tip forward at 2,600 lbs (1,179 kg). For safe excavation and pallet loading on rough ground, loads should strictly remain under 1,300 lbs.
Can a Bobcat 743 run high-flow hydraulic attachments?
No. The Bobcat 743 features a standard-flow gear pump circuit delivering 11.0 GPM at 2,050 PSI (13.2 hydraulic horsepower). It cannot run high-flow forestry mulchers or asphalt cold planers, but operates post hole augers, hydraulic trenchers, 4-in-1 buckets, and light rotary cutters efficiently.
What engine oil should I use in the Kubota V1702 diesel?
Kubota and Bobcat recommend heavy-duty diesel engine oil meeting API CK-4 or CJ-4 specifications. In temperatures above 32°F (0°C), use SAE 15W-40. In freezing winter plowing conditions below 32°F, switch to SAE 10W-30 to ensure rapid cold oil pressure delivery.