1999 LAND ROVER DISCOVERY Workshop Manual

AUTOMATIC GEARBOX - ZF4HP22 - 24
44-52 REPAIRS
7.Release speed sensor and remove valve body.
8.Remove and discard 'O' ring from multiplug
connector. Refit
1.Clean valve body and mating faces.
2.Fit new 'O' ring to multiplug connector block.
3.With assistance, position multiplug to gearbox
housing and tighten nut.
4.Align valve body to gearbox, ensure manual
valve is correctly located. Position speed
sensor retaining bracket, and tighten screws
to 8 Nm (6 lbf.ft).
5.Connect multiplug to gearbox connector.
6.Fit gearbox oil filter.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Filter - oil.

AUTOMATIC GEARBOX - ZF4HP22 - 24
REPAIRS 44-53
Seal - valve body
$% 44.20.13
Remove
1.Remove valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
2.Remove circlips and springs from gearbox
casing noting location of long and short
springs.
3.Using tool LRT-44-005, remove and discard
seals from gearbox casing. Refit
1.Clean gearbox casing, springs and circlips.
2.Fit new seals using tool LRT-44-005, ensure
seals are fully seated.
3.Position springs in their correct locations and
secure with circlips.
4.Fit valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.

AUTOMATIC GEARBOX - ZF4HP22 - 24
44-54 REPAIRS
Pressure regulator
$% 44.40.22
Remove
1.Remove valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
2.Release and remove clip securing pressure
regulator solenoid valve harness to valve body.
3.Disconnect multiplug from pressure regulator
solenoid valve.
4.Remove 5 Torx screws securing pressure
regulator to valve body and remove pressure
regulator.Refit
1.Clean pressure regulator and mating face with
a lint free cloth.
2.Position pressure regulator to valve body, fit
Torx screws and tighten to 8 Nm (6 lbf.ft).
3.Connect multiplug to pressure regulator
solenoid valve, fit clip and secure harness to
valve body.
4.Fit valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
M44 1351
3

AUTOMATIC GEARBOX - ZF4HP22 - 24
REPAIRS 44-55
Lock-up solenoid valve (MV 3)
$% 44.15.35
Remove
1.Remove valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
2.Disconnect multiplug from lock-up solenoid
valve and release harness from clip.
3.Remove Torx screw and retaining fork securing
solenoid valve to valve body.
4.Remove solenoid valve from valve body.Refit
1.Clean lock-up solenoid valve with lint free cloth.
2.Position solenoid valve in valve body.
3.Position retaining fork, fit and tighten Torx
screw to 8 Nm (6 lbf.ft).
4.Connect multiplug to lock-up solenoid valve
and secure harness in clip.
5.Fit valve body assembly.
+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
M44 1354A
2
3
4

AUTOMATIC GEARBOX - ZF4HP22 - 24
44-56 REPAIRS
Solenoids - shift control valves
(MV 1 & 2)
$% 44.15.45
Remove
1.Remove valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
2.Remove 3 Torx screws securing lock-up
solenoid valve assembly to valve body and
move solenoid aside.
NOTE: This is to gain access to remove Torx
screw and MV2 shift control valve.
3.Note their fitted position and disconnect
multiplugs from shift control valves MV 1 and
MV 2.
4.Remove Torx screw and retaining fork securing
MV2 shift control solenoid valve to valve body.
Note that the tag on the retaining fork faces
towards the valve body.
5.Remove shift control valve from valve body.Refit
1.Clean MV2 shift control solenoid valve with lint
free cloth.
2.Position MV2 shift control solenoid valve to
valve body.
3.Position retaining fork, fit Torx screw and
tighten to 8 Nm (6 lbf.ft).
4.Connect multiplugs to both shift control
solenoid valves.
5.Clean lock-up solenoid valve assembly with a
lint-free cloth.
6.Position lock-up valve assembly, fit and tighten
Torx screws to 8 Nm (6 lbf.ft).
7.Fit valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
M44 13521
M44 1353A

AUTOMATIC GEARBOX - ZF4HP22 - 24
REPAIRS 44-57
Harness - solenoid valves
$% 44.15.52
Remove
1.Remove valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
2.Release and remove clip securing pressure
regulator solenoid harness to valve body.
3.Disconnect multiplug from pressure regulator
solenoid valve.
4.Disconnect multiplugs from lock-up solenoid
valve, shift control solenoid valves MV 1 and
MV 2.
5.Release harness from 5 clips on valve body
and remove harness.6.Disconnect and remove speed sensor from
harness.
Refit
1.Connect speed sensor to harness multiplug.
2.Position harness to valve body.
3.Connect multiplugs to shift control solenoid
valves MV 1 and MV 2 and lock-up solenoid
valve.
4.Connect multiplug to pressure regulator
solenoid valve and secure solenoid valve
harness with clip to valve body.
5.Position and secure harness in clips on valve
body.
6.Fit valve body assembly.

+ AUTOMATIC GEARBOX - ZF4HP22
- 24, REPAIRS, Valve body assembly.
M44 1350
M44 1355
M44 1359

AUTOMATIC GEARBOX - ZF4HP22 - 24
44-58 REPAIRS
Electronic control unit - automatic
transmission
$% 44.15.46
Remove
1.Release fixings and remove battery cover.
2.Disconnect battery earth lead.
3.Remove 3 screws and trim clip securing lower
trim casing to LH front seat.
4.Remove 3 nuts securing speaker power
amplifier bracket to the body.
5.Disconnect multiplug from automatic
transmission ECU located on underside of
amplifier mounting bracket.6.Remove 2 nuts securing ECU to mounting
bracket and remove ECU.
Refit
1.Position ECU to mounting bracket and secure
with nuts.
2.Connect multiplug to ECU.
3.Position speaker power amplifier mounting
bracket to body and secure with nuts.
4.Position lower trim casing to seat and secure
with screws and trim clip.
5.Connect battery earth lead.
6.Fit battery cover and secure fixings.

PROPELLER SHAFTS
DESCRIPTION AND OPERATION 47-1
PROPELLER SH AFTS DESCRIPTION AND OPERAT ION
Propeller shaft component layout
1Rear axle and brake discs
2Transfer box
3Front axle and brake discs4Front propeller shaft
5Rear propeller shaft
M47 0237B
1
2
3
4
5