Tadano TR-800XXL4, Руководство по обслуживанию

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3
W577-0152E
T - 2 T - 2
Brake (Service Brake)
1.1 Principle of operation
1. When hydraulic pressure is applied
The pistons exert force to the pad assy by
deforming the piston seals. (Fig. 2)
2. When hydraulic pressure is removed
The seals recover the original shape to push the
pistons back, creating clearance between the disc
plate and the pad assy. (Fig. 3 )
3. When pad assy wears
The piston displacement distance increases
beyond the seal deformation limit, and the pistons
slip relative to the seals, but when the hydraulic
pressure is removed, the pistons are pulled back
by the seals through the same distance as before
the occurance of wear, giving the same
clearances.
2. Checking the pad assy
[NOTICE]
The brake caliper must be disassembled to check
the remained pad thickness. However, the check
gauge may use to check.
The simple check method of pad assy is shown as
follows:
Check the pad thickness by inserting a check gauge
as shown below in the check holes in the torque
plate.
R
0.
2
C
0.5
IW577-017201
90
5
.5
9
60±0.2
[NOTICE]
When one of the pad assy is found to have worn to
the use limit, all the other ones are also worn to the
same limit in most cases.
Replace the pad assy for the right and the left
wheels or even for all the four wheels
simultaneously.
Thickness of the brake lining of the Pad assy
Thickness of the brake lining
New parts 14 mm (0.56in)
Use limit 4 mm (0.16in)
The regular check is necessary to prevent from
deteriorating brake function and from the brake
damage since the thickness of the brake lining
exceeding the limit results in serious damage.
Replace the pad assy when this
distance becomes zero.
Piston
Back plate
Pad assy
Brake lining
Disc plate
IW577-0190E02
Check gauge
3. Checking the disc plate
Check the disc plate for the thickness and
damage. If it is excessively damaged or the
thickness is below 17.5 mm (0.689 in), replace the
disc plate. (Thickness of new disc plate: 20 mm
(0.787 in))
(Unit: mm) (1mm=0.039inch)