Specifications, Service and Repair of Farm and Lawn Tractors


Massey Ferguson 6485 Tractor Specs Overview

Massey Ferguson 6485 Tractor Engine

Engine Model - Agco Sisu Power 66 CTA
Engine Power, Rated, hp (kW) - 160 (119)
Engine Speed, rpm - 2200
Power Boost, hp (kW) - No boost
Fuel Tank, gal (L) - 93.8 (355)
Cylinders - 6
Displacement, cu in (L) - 403 (6.6)
Engine Bore, in (mm) - 4.25 (108)
Engine Stroke, in (mm) - 4.73 (120)
Block Design, Replaceable Liners - Replaceable wet liners
Aspiration, Turbocharged or Naturally Aspirated - Turbo air to air aftercooled
Fuel System Type - High Pressure Common Rail
Fuel System Control - Electronic
Fuel Injection to combustion chamber - Direct
Emission Level - Tier 3
Exhaust Gas Recirculation - Internal EGR
Exhaust Pipe - Vertical
Fan Drive Type - Belt
System Rating, Volts - 12
Alternator Rating, Amps - 120 Std / 150 Opt

MF 6485 Tractor Transmission

Description - Auto 6 Semi Powershift
Transmission Type - Synchronized Gear
Forward / Reverse Speeds - 24F / 24R
Maximum Speed Forward, mph (kph) - 24.9 (40)
Creeper Range - Yes
Shuttle (Forward-Reverse) - Yes

Massey Ferguson 6485 Tractor PTO

PTO Horsepower, hp (kW) - 130 (97)
PTO Speeds, rpm - 540 / 540E / 1000 / 1000E
PTO Type - Independent


Drive Wheels - 2WD / 4WD
Steering - Front Steer

MF 6485 Tractor Rear Axle

Final Drive - Planetary / Inboard
Axle Output End - Bar standard
Axle Bar Diameter, in (mm) - 3.74 (95)
Suspended Front Axle Available - Opt / Std w/50Kph Trans


Brake Type - Wet Disc

Massey Ferguson 6485 Tractor Hydraulic System

Hydraulic System Type - Closed Center PFC
Main Hydraulic Pump Type - Gear Pump
Standard Pump Flow, gpm (Lpm) - 29 (110)
Optional Pump Flow, gpm (Lpm) - 39 (150)
Standard Remote Valves - 3

3-Point Hitch Features

3-Point Hitch - Category 3
Optional Hitch Category - Category 3N
Draft Sensing or Lift Control - Lower Link
Draft Link Ends Adjustable - Yes

3-Point Hitch Lift Capacity

Standard Lift Capacity 24 Inches behind pin, lb (kg) - 16,500 (7480)


Drawbar Description - Swinging

MF6485 Tractor Wheelbase

2WD, in (mm) - 118 (2996)
4WD, in (mm) - 118 (2996)

Tire Size

Front Tire Size, 2WD - 11.00 x 16
Front Tire Size Width, 4WD - 14.9R30
Rear Tire Size Width - 18.4R42

Massey Ferguson 6485 Tractor GPA40 Rear Axle

Disassembling and reassembling the MF6485 Tractor Rear PTO clutch

Remove the clutch. Separate the clutch from its support.

Remove the seal rings. If necessary, discard them.

Remove the screws. Remove:

- the bell housing;
- the discs and intermediate plates;
- the drive gear

Secure the front part of the MF 6485 Tractor clutch unit in a vice fitted with protective jaws.

Remove the screw, using a makeshift tool to hold back the spring. Remove the chamfered washer.

Gradually release the spring using the tool. Remove:

- the hub;
- the seat;
- the spring;
- the support;
- the Belleville progressivity washer.

Remove the piston by firmly striking the clutch unit against the wooden edge of a workbench or failing that, against block of a similar nature. Remove and discard the "O" rings, and. If necessary, remove the circlip (oil deflector).

Extract or drive out:

- the bearing on the support;
- the bearing on the unit, visually noting the positioning of its sealed face;
- the bearing by first removing the snap ring.

Preparing for reassembling

Clean and check all components. Replace those that are defective. Check the clearance of the valve ball by vertically and rapidly shaking the unit: rattling against the unit should be heard.

If removed, press fit the sleeve in the unit. Before fitting, the fitted section of the sleeve must be lightly smeared with Loctite 648 or equivalent. Clean off any excess Loctite. Check that the various hydraulic ports are not obstructed after the fitting process.

Using a press and a suitable fixture in contact with the external surface of the bearing, Install the bearing up to the shoulder of the hub. Install the snap ring.

Position the sealed face of the bearing towards the unit. Using a press and a suitable fixture in contact with the internal surface of the bearing, Install this bearing against the unit.

Using a press and a suitable fixture in contact with the external surface of the bearing, Install the bearing up to the shoulder of the support. After fitting, check that the bearings turn correctly.

Install the circlip (oil deflector). Lubricate and Install the new seals on the sleeve and piston respectively.

Install the piston using a soft hammer, checking during the fitting process that there are no fragments of seal on its rim.


- the Belleville progressivity washer;
- the support;
- the spring;
- the spring seat.

Reinstall the pre-assembled hub, using the tool used during disassembly to progressively compress the spring. Secure the front part of the Massey Ferguson 6485 Tractor clutch unit in a vice fitted with protective jaws.

Position the chamfer of the washer. Position this washer in the drive hub. Lightly smear the thread of the screw with Loctite 270 or equivalent. Tighten this screw to a torque of 24-28 Nm.

If the clutch discs have been replaced, the new discs must be soaked for approximately one hour in clean transmission oil.

Stack the new or reused discs and intermediate plates, starting with an intermediate plate against the spring support. Install the discs and intermediate plates alternately until the number removed during disassembly is reached. Reinstall the bell housing and the drive gear in the correct position.

Lightly smear the thread of the screws with Loctite 242 or equivalent. Tighten these screws to 25.5-34.5 Nm. Install the seal rings. Reconnect the clutch and its support. Install the assembly.