Suspended Fwd Axle Operation - New Holland T8010 Manual

The front axle suspension system:
A. allows increased operating speeds with greater tractor stability in the field and on the road.
B. improves ride quality and operator comfort when working on rough terrain and for high speed shuttling.
C. provides better front tire to ground contact for improved tractor control and prolonged tire life.
Automatic front suspension is beneficial in most applications, but can be disengaged when performing some front
hitch and loader operations.
The suspended axle will default to the auto mode when the tractor is started. However, the axle will be locked until
the tractor reaches 1.0 km/h (0.6 mph) for one second. When the transmission controller sees 1.0 km/h (0.6 mph)
for one second it will energize both lockout solenoids (3) and (4) activating the system. Pressing and releasing the
suspended axle switch to the momentary position will turn off the system, this will lock the axle in position and the
light on the switch will illuminate. The lockout solenoids are PWM type and will ramp up from 0 to 1.5 amp in about
a 5 seconds. These solenoids are PWM to avoid any unwanted movement of the front axle that may occur if the
solenoids simply turn on or off.
With the system turned off, the axle will be locked in position until the tractor reaches 12 km/h (7.5 mph), at 12 km/h
(7.5 mph) the system will switch to the auto mode for roading. This can only be overridden with the Electronic
Service Tool (EST) connected and the DEMO mode accessed through the ICU.(See demonstration instructions in
this section). This will allow the operator to experience the difference at road speed with and without the suspension
axle function.
The transmission controller controls the suspension system. The controller receives a signal from the position
potentiometer. The controller in turn sends signals to four solenoids located on the hydraulic control valve. The
lockout solenoids (3) and (4) are energized anytime the system is on. The control valve receives its supply oil from
the PFC pump. The control valve is also connected to the PFC piston pump compensator through a signal line.
When additional oil is needed in the system the signal line communicates this need to the pump. The control valve
is also plumbed to sump for when oil flows over a relief valve and when the axle is lowered.
1. RAISE SOLENOID
2. LOWER SOLENOID
3. LOCKOUT SOLENOID
4. LOCKOUT SOLENOID
5. UNLOAD VALVE
Section 25 - Four-Wheel Drive Front Axle - Chapter 5

SUSPENDED FWD AXLE OPERATION

3
4
6
12
11
6. RELIEF VALVE
7. RELIEF VALVE
8. CHECK VALVE
9. ORIFICE
10. RELIEF VALVE
19
10
14
9
8
7
11. CHECK VALVE
12. ORIFICE
13. ORIFICE
14. CHECK VALVE
15. ORIFICE
25-5-3
1
15
2
5
13
16. TANK
17. SUPPLY
18. SIGNAL LINE
19. ACCUMULATOR
18
17
16
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