LR3/Disco 3
The gearbox comprises the main casing which houses all of the transmission components. The main case also
incorporates an integral bell housing.
A fluid pan is bolted to the lower face of the main case and is secured with bolts. The fluid pan is sealed to the main case
with a gasket. Removal of the fluid pan allows access to the Mechatronic valve block. The fluid pan has a magnet located
around the drain plug which collects any metallic particles present in the transmission fluid.
A fluid filter is located inside the fluid pan. If the transmission fluid becomes contaminated or after any service work, the
fluid pan with integral filter must be replaced.
The integral bell housing provides protection for the torque converter assembly and also provides the attachment for the
gearbox to the engine cylinder block. The torque converter is a non-serviceable assembly which also contains the lock-up
clutch mechanism. The torque converter drives a crescent type pump via drive tangs. The fluid pump is located in the
main case, behind the torque converter.
The main case contains the following major components:
Input shaft
Output shaft
Mechatronic valve block which contains the solenoids, speed sensors and the TCM
Three rotating multiplate drive clutches
Two fixed multiplate brake clutches
A single planetary gear train and a double planetary gear train.
ZF 6HP26 Automatic Transmission – Sectional View
11
-
Electrical connector – guide sleeve
12
-
O-ring
13
-
O-ring
14
-
Pump housing (not a serviceable component)
15
-
Input shaft seal
16
-
Torque converter
CAUTION : Take care when removing the fluid pan and/or replacing the Mechatronic valve block that
neither the fluid pan gasket or the mating face on the transmission casing is damaged or leakage may occur. Do
not use metal tools to prise the fluid pan from the transmission casing. Take care when positioning a new
mechatronic unit to ensure it does not contact the casing face.
