Synchro Shuttle Gearbox Description - jcb 214e Service Manual

Synchro Shuttle Gearbox
Component Identification
A Forward/reverse clutch unit
B Transmission oil pump
C Torque converter pressure regulating valve
D Oil pressure maintenance valve
E Solenoid control valve
F Mainshaft
G Synchromesh unit - 3rd/4th gears
H Layshaft
J Synchromesh unit - 1st/2nd gears
K Transfer gear, output shaft and yoke
L 4WD output yoke (if fitted)
M 2/4WD clutch unit (if fitted)
N 4WD solenoid control valve (if fitted)
P Oil strainer
Q Oil filter
R Gear selection turret assembly
S Torque Converter
T Driveshaft (drives machine main hydraulic
pump)
U Hydraulic pump mounting face
V Torque converter relief valve
W Oil pressure switch
X Hose connection - to cooler
Y Hose connection - from cooler
Z Gearbox oil cooler
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Principle of Operation
This Illustration shows a typical JCB Syncro Shuttle
which consists of a torque converter, hydraulic
reverser unit, and integral manual 4-speed gearbox.
The reverser unit A has a pair of hydraulically
operated clutches giving forward - neutral - reverse
drive. Oil pressure is provided by a crescent type
pump B driven at engine speed by the drive lugs of
the torque converter. The oil pressure is controlled
by maintenance valve D, and clutch selection is
achieved by means of an electric solenoid valve E.
Drive is transferred from the reverser unit by helical
gears to the mainshaft F, which carries the 3rd/4th
synchromesh unit G, and to the layshaft H, which
carries the 1st/2nd synchromesh unit J.
Synchromesh unit G is of the 'Blocking Pin' type, a
full description of which is given in this section.
Synchromesh unit J features rings and cones with a
sliding sleeve.
Drive is transmitted finally via the output shaft K to
the rear axle. If 4 wheel drive is selected, the front
wheels are also driven via 4 wheel drive output
yoke L.
Driveshaft T is permanantly driven by the engine
and runs through the hollow forward/reverse unit
shaft to the back of the gearbox. The shaft (T)
drives the gearbox mounted machine main
hydraulic pump.
Gearbox oil is cooled by an air blast cooler Z. The
cooler is part of the front mounted machine 'cooling
pack'.
Purchased from www.WorkshopManuals.co.uk
Z
A401330