TRANSMISSION AND TORQUE CONVERTER 5540F/YB5515 SERVICE MANUAL
7-4 Published 10-21-2010, Control# 198-04
transmission unit to pass through the centre of the input shaft
A3 for clutch lubrication. Oil then returns to the sump.
Lubrication oil is also provided via a pump drain line to the
forward/reverse front shaft bearing A4. The drain from
pressure maintaining valve D also provides lubrication for
idler gear bearing F.
Solenoid Valve Operation
Pressurised oil at the solenoid valve E is used to control the
forward/reverse clutches A1 and A2.
Forward:
In the diagram, electrical solenoid E1 is energized by the
forward/reverse control lever in the cab. Pressurised oil is
diverted to the forward clutch A1 and forward is selected. A
restrictor orifice in the feed to the solenoid valve modulates
the pressure to the clutch to smooth engagement. At the
same time oil from reverse clutch A2 is diverted back to the
sump via solenoid valve E.
Reverse:
When reverse is selected electrical solenoid E2 is energized
and pressurised oil is diverted to the reverse clutch A2. At
the same time oil from clutch A1 is diverted back to the
sump.
Neutral:
When neutral is selected (via the control lever or the
transmission dump button), the flow of the pressurised oil is
blocked at the solenoid valve. No solenoids are energized
and no clutches engaged.
For a further detailed description refer also to Reverser
Clutch.
The 2/4-wheel drive clutch M is controlled by solenoid valve
N. A full description of 2/4-wheel drive clutch operation is
given in Hydraulic 2/4-Wheel Drive Unit Operation.
Reference Only
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