Your loader is down and the clock is running. This Bobcat 440, 443 service manual PDF (OEM #6566694) takes the 440, 443, and 443B Skid-Steer Loader from hydrostatic pumps to Bob-Tach. The 346 pages hold hydraulic and hydrostatic schematics with full fluid routing, wiring diagrams for both the 440 and 443 alternator systems, alongside step-by-step service procedures. Dedicated troubleshooting covers the hydraulic, hydrostatic, and electrical systems, and torque specifications break down by component group. Torque the tilt cylinder bolts to 190–220 ft.–lbs. (258–285 Nm), then swap the hydraulic filter at the factory 100-hour interval using the specified 10-micron cartridge. Bookmarked and searchable, it opens on any device, so you can pull it up at the machine and get back to work.
What's Inside This Bobcat 440, 443, 443B Manual
| System | Pages | Key Topics |
|---|---|---|
| Maintenance Safety | 3-4 | - |
| Hydraulic System | 35-90 | Hydraulic / Hydrostatic Schematics, Troubleshooting, Hydrostatic System Information (37° Flare Connections, Straight Thread O–Ring Fitting, Tubelines and Hoses) |
| Hydrostatic System | 91-140 | Troubleshooting, Hydrostatic System Information (Replenishing Valves Function) |
| Drive System | 141-156 | Parking Brake (Adjustment, Removing Parking Brake, Inspecting the Parking Brake, Installing the Parking Brake), Drive Chains (Removing the Drive Chain, Installing the Drive Chain) |
| Main Frame | 157-172 | Operator Cab (Raising the Operator Cab, Lowering the Operator Cab, Jumper Start Switch, Removing the Operator Cab, Installing the Operator Cab) |
| Electrical System | 173-224 | Electrical Schematics, Troubleshooting, Battery, Operator Cab Wire Harness, Engine Wire Harness, Alternator System (440), Alternator System (443) |
| Engine Service | 225-312 | Engine Service - Kohler (Troubleshooting, Engine & Attaching Parts, Ignition System, Carburetor and Governor, Reconditioning the Engine) |
| Technical Data | 313-324 | Loader Specifications (Loader Dimensions, Operations & Performance, Engine, Hydraulic System, Electrical, Drive System, Capacities, Tires) |
| Specifications | 325-342 | Torque Specifications (Engine Group – 440 Loader, Engine Group – 443 Loader, Fuel System Group, Steering Controls & Panel Group, Bob–Tach & Lift Arm Group, Seat Bar & Pedal Group, Brake, Chaincase & Axle Group, Hydraulic Group, Operator Cab, Main Frame & Rear Door Group, Hydrostatic Group – 440 Loader, Hydrostatic Group – 443 Loader) |
| Service Manual Revisions | 343-346 | 440-1, 440-2 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Wheel Nuts Torque | 40–45 ft.–lbs. (54–61 Nm) | p. 30 |
| Lift Cylinder Bolt Torque | 150–160 ft.–lbs. (203–217 Nm) | p. 82 |
| Tilt Cylinder Bolt Torque | 190–220 ft.–lbs. (258–285 Nm) | p. 82 |
| Hydraulic Filter Element Replacement Interval | every 100 hours | p. 11 |
| Hydraulic Filter Type | 10 micron replaceable cartridge | p. 316 |
| Air Filter Element Replacement Interval | every 50 hours | p. 15 |
| Air Filter Element Type | Dry replaceable paper element | p. 315 |
| Hydraulic Hoses and Fittings Torque (General) | 90–100 ft.–lbs. (123–135 Nm) | p. 335 |
| 37° Flare Connections Tightening (example) | 2-1/2 hex flats for 1/2-20 thread size | p. 50 |
| 440 | ||
| Engine Oil and Filter Replacement Interval | every 50 hours | p. 18 |
| 443, 443B | ||
| Engine Oil and Filter Replacement Interval | every 100 hours | p. 18 |
| 443 | ||
| Alternator Belt Tension | 1/4’’ (6,35 mm) movement | p. 198 |
Bobcat 440, 443, 443B Common Problems This Manual Covers
Bobcat 440, 443, and 443B lift arms won't raise or tilt, hydraulic action sluggish at full throttle
Check hydraulic fluid level and fill to capacity with Melroe hydraulic/hydrostatic fluid (P/N 6563328) or 10W-30 SAE motor oil per page 339. Replace the 10-micron filter cartridge every 100 hours (page 11). If arms still rise slowly at full RPM, work through the hydraulic troubleshooting procedures and verify system relief pressure measures 1270-1330 PSI (8756-9170 kPa).
Manual Section: Hydraulic System TroubleshootingMachine lurches or pulls to one side, travel control jerky in both directions p. 91
Confirm tire pressure at all four corners first. Each tire must sit at 40 PSI (276 kPa) per the specs on page 316. Uneven inflation alone causes pulling and erratic tracking. If pressure checks out, work through the hydrostatic troubleshooting procedures on page 91, covering straight-line tracking loss, no-drive conditions, and erratic drive behavior.
Manual Section: Hydrostatic System TroubleshootingEngine cranks slowly or won't fire, especially after cold weather or extended storage p. 225
Inspect battery terminals for corrosion and tighten all cable connections. Check engine oil level; on the 440, fill with straight SAE 30 oil above 32°F (0°C) and change oil and filter every 50 hours per page 18. For cold-start and no-start diagnosis, open the engine troubleshooting section starting on page 225 and work from the slow-cranking symptoms forward.
Manual Section: Engine ServiceBattery repeatedly loses charge, alternator warning light stays on during normal operation p. 173
Measure alternator belt tension before digging into wiring. On the 443, deflection must be 1/4'' (6.35 mm) per page 198; for Motorola alternator applications, adjust to 3/8'' (9.5 mm) deflection under 20 lbs. (89 N) of force (page 216). From there, work through the electrical troubleshooting procedures on page 173 to isolate the fault in the alternator, regulator, or wiring harness.
Manual Section: Electrical System TroubleshootingHydraulic fluid leaking from hoses, fittings, or tube connections under the machine p. 335
Trace every hose assembly and tube line for chafing, cracks, or wet fittings. Torque hydraulic hose connections to 90-100 ft.-lbs. (123-135 Nm) per the specifications on page 335. For 37° flare connections, use the hex-flat tightening method shown on page 50 rather than guessing by feel. Once retorqued, clean the area and cycle the hydraulic system to confirm the leak is sealed.
Manual Section: Hydraulic SystemParking brake won't hold on a slope, machine rolls after operator leaves the seat p. 141
Open the Drive System section on page 141, which covers parking brake adjustment, removal, inspection, and reinstallation procedures. Inspect brake lining thickness and all linkage components for wear before attempting adjustment. After reinstalling, verify the brake holds the machine stationary on the steepest slope you work on. Retorque wheel nuts to 40-45 ft.-lbs. (54-61 Nm) per page 30 during reassembly.
Manual Section: Drive SystemFrequently Asked Questions
What are the torque specs for Bobcat 440/443/443B wheel lug nuts?
Torque the wheel nuts on Bobcat 440/443/443B loaders to 40–45 ft.–lbs. (54–61 Nm). Check tightness every 8 hours through the first 20 hours of operation, then every 50 hours after that.
What are the hydraulic relief valve settings on a Bobcat 440B?
Relief valve pressure must read between 1435 – 1495 PSI (9894 – 10308 kPa). Take the reading on the gauge after bringing engine RPM to maximum and turning the restrictor control on the tester.
What are the replacement specifications for hydraulic filter?
Replace the hydraulic filter element every 100 hours of operation, or sooner in dusty conditions. The procedure runs in order: stop the engine, raise the operator cab, clean the area, then pull the plug from the filter housing to drain fluid before fitting the new element.
What are the replacement specifications for engine oil and filter?
On the 440, replace engine oil every 25 hours of operation, or every 50 hours for S/N 25000 & Above. On the 443 and 443B, change both oil and filter every 100 hours of operation.
Is this Service Manual a digital download?
This is a 346-page searchable PDF ready for immediate download. It works on any device, so pull it up on your phone right at the machine. No shipping, no waiting.
Are there any print restrictions on this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Does this Bobcat 440, 443, 443B manual include hydraulic schematics?
Yes, this Bobcat 440, 443, 443B Service Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
Document Quality
This document is a scanned PDF, meaning the text is embedded as images rather than native digital characters. While an OCR layer is present for some text, allowing for searchability and copying of certain elements like the copyright notice, most of the manual's content, including the main body text and table of contents, is image-only and not selectable or searchable. The text quality is generally crisp and easy to read throughout. Diagrams and illustrations are a mix of raster images and photos; labels within these visuals are consistently readable. Pages are clean with no notable scan artifacts, stains, marks, or skewing. There are no blank or filler pages.
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