Specifications, Service and Repair of Farm and Lawn Tractors

________________________________________________________________________________

Low pressure MF 6460, 6455, 6445, 6265 tractor hydraulic system for GBA20 and GBA25 gearboxes

Low pressure Massey Ferguson 6460, 6455, 6445, 6265 system hydraulic for GBA20 gearbox



Legend

A - Gearbox
B - Centre housing
C - Low pressure main supply (17 bar)
D - Low pressure supply (17 bar) for Power Shuttle forward or reverse clutches
E - Unit housing the control for the Power Shuttle and for the Dynashift
F - Main accumulator
G - Accumulator connected to the brake master cylinder hydraulic line
H - Return - MF 6460, 6455, 6445, 6265 tractor Power Shuttle forward and reverse clutches
I - Supply - A/B clutch (forward travel) for Dynashift
J - Non-return valve
K - Filter

Low pressure (17 bar) Nitrogen

The supply line for the C/D clutch (reverse travel) for Dynashift is masked by the control unit. It is located between the latter and the gearbox.

Specifications of accumulators F and G

Accumulator F assists the low-pressure hydraulic line. Accumulator G maintains the brake master cylinder hydraulic line under pneumatic pressure as soon as the
tractor stops (ignition switched off).

These two accumulators have the same specifications:

- Brand: HYDAC
- Type: 1/20
- Capacity: 1 l
- Gas: Nitrogen
- Inflation pressure: 8 to 10 bar

The pressure should be checked every six months, with the engine stopped.

Low pressure Massey Ferguson 6455, 6460, 6445, 6265 hydraulic system for GBA25 gearbox (40 kph version)



Legend (Fig. 6, Fig. 7)

A - Gearbox/Powershift module assembly
B - Centre housing
C - Low pressure main supply (21 bar)

E - Unit housing the control:

- for the Power Shuttle
- for the Dynashift module
- for the multiplier module

F - Main accumulator
G - Accumulator connected to the brake master cylinder hydraulic line
K - Filter
L - Low pressure supply (21 bar) for the Powershift module and the Power Shuttle
M - Low pressure supply (21 bar) for range solenoid valves on gearbox type GBA25
N - Range 1 and 2 solenoid valves
O - Range 3 and 4 solenoid valves



Specifications of accumulators F and G

Accumulator F assists the low-pressure hydraulic line. Accumulator G maintains the brake master cylinder hydraulic line under pneumatic pressure as soon as the MF 6460, 6455, 6445, 6265 tractor stops (ignition switched off).

These two accumulators have the same specifications:

- Brand: HYDAC
- Type: 1/20
- Capacity: 1
- Gas: Nitrogen
- Inflation pressure: 8 to 10 bar

The pressure should be checked every six months, with the MF 6460, 6455, 6445, 6265 tractor engine stopped.

Low pressure system for gearbox type GBA25 with high pressure braking unit



Legend (Fig. 9)

A - Gearbox/Powershift module assembly
B - Centre housing
C - Low pressure main supply (21 bar)

E - Unit Massey Ferguson 6460, 6455, 6445, 6265 tractor housing the control:

- for the Power Shuttle
- for the Dynashift module
- for the multiplier module

F - Main accumulator
K - Filter
L - Low pressure supply (21 bar) for the Powershift module and the Power Shuttle
N - Range 1 and 2 solenoid valves
O - Range 3 and 4 solenoid valves
P - High-pressure braking unit
Q - Accumulator

Specifications of accumulators F and Q

Main low pressure accumulator F

- Brand: HYDAC
- Type: 1/20
- Capacity: 1
- Gas: Nitrogen
- Inflation pressure: 8 to 10 bar

Accumulator Q for high-pressure braking unit

- Brand: HYDAC
- Type: SBO210
- Capacity: 1.4 l
- Gas: Nitrogen
- Inflation pressure: 53 to 56 bar.

MF 6455, 6460, 6445, 6265 tractor thermo valve



Legend

(1) Thermo valve

E - Lubrication system oil inlet
R - Routing of oil to the cooler
S - Oil outlet to hydraulic components for lubrication

1.Routing of oil being heated (E to S)
2.Routing of hot oil (E to R)

________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________