UDRF01.04GB
Maintenance manual DRF 400–450
6 Suspension – 6.3.2 Rims
19
O. Circumference
D. Diameter
4 Check the rim's diameter.
Measure the rim edge's circumference (O) with a measuring
tape and calculate the diameter (D). [D = Circumference (O) /
3.14]
Compare the value of the diameter with the specified min.
measurement. If the diameter is smaller, the rim, lock ring and
the rim bead seat taper must be discarded and replaced with
new parts.
Information about min. diameter can be obtained from Kalmar
Industries.
5 Check for damage in the areas with high stress concentration.
Checking is done in two steps:
1.
The magnetic powder method is used to determine if
there's a crack or not, and where it is.
2.
Confirmed cracks are investigated further with penetrating
fluid.
Typical rim damages are circumference cracks, corrosive dam-
age, rust, warping and wear.
Magnetic powder method
1 Blast clean the marked area around the entire rim so that it is
completely clean from all paint.
2 Test using magnetic powder and the following equipment:
•
Equipment: Yoke Tiede
•
Method:
a. AC current
b. Contrast fluid
•
Checking medium:
a. Wet
b. Fluid (e.g. Tiede Ferrolux)
If no cracks are detected with the magnetic powder method,
checking is finished and the rim is approved.
If cracks are indicated, the crack should be investigated further
with penetrating fluid.
D
001701
O
001702
001703
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