Table of Contents
Advertisement
www.WorkshopManuals.co.uk
Section G
30 - 2
Removal and Replacement
! WARNING
Before working on the brake system make sure the
machine is on level ground and chock all four wheels.
BRAK 1-4
Removal
1
Gain access the the brake pedal box assembly.
Remove the steering wheel, column switches and
console assembly. See Section D, Steering Column -
Removal for procedures.
2
Working outside the cab, loosen and remove brake
pipe unions B, plug and cap to prevent loss of fluid and
ingress of dirt.
3
Remove the brake pipes from the master cylinders:
master cylinders bridging pipe D; axle feed pipes E and
reservoir supply pipes H.
4
Working inside the cab, remove the brake pedals clevis
F and disengage the brake pedal from the servo unit
(both pedals).
Loosen and remove the servo unit retaining nuts G
5
(both units).
6
Tag the cylinders (left and right hand). Remove the
master cylinder and servo units.
9803/3280
Master Cylinder and Servo Unit
Purchased from www.WorkshopManuals.co.uk
Brakes
Replacement
Replacement is a reversal of the removal sequence.
Refit the cylinders in their original positions.
If the brake master cylinders or brake servo units are
removed it is recommended that the servo brake assembly
operating rod measurement is checked.
If the rod length is not checked it may result in differing
brake pedal travel which could result in uneven braking.
1
With the brake master cylinder removed, measure from
the face of the servo unit to the end of the servo brake
rod as shown at J which should be 8.5 to 8.3mm (0.334
to 0.326in).
2
Adjust measurement J by screwing domed bolt K in/out
as required, secure in position with JCB Threadlocker &
Sealer.
Note: If no adjustment is required make sure the domed bolt
K can not be rotated by finger pressure.
Use of incorrect fluid will cause serious damage to the
seals which could in turn cause brake failure.
BRAK 1-1
3
Fill the brake system with JCB Light Hydraulic Fluid and
bleed the system. Refer to Service Brakes - Bleeding.
Note: 4WS machines do not have dual pedal braking.
Procedures described still apply to a single pedal
application.
4
Unlatch pedals and ensure that pedal pads are level
with each other and fully back against their stops.
5
Adjust pedal linkages for free movement to give 1 mm
(0.040 in) on each pushrod.
6
With pedals still unlatched, apply an equal force to each
pedal and check if pedals remain level. If necessary
adjust by increasing the clearance on one of the
pushrods. Do not decrease either clearance below 1
mm (0.040 in).
7
On completion bleed the brake system and check the
brakes operate correctly and that machine stops in a
straight line. Refer to Service Brakes - Bleeding.
8
Latch pedals and check for straight line braking; if
satisfactory straight line braking cannot be achieved
refer to Fault Finding.
Torque Settings
Item
Nm
kgf m
H
30-34
3.0-3.5 22-25
Section G
! WARNING
lbf ft
30 - 2
Issue 1
Advertisement
Table of Contents
