DAF LF45, LF55 Series. Manual - part 615
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LF45/55 series
Leaf suspension
DIAGNOSTICS
2-1
2. LEAF SUSPENSION
2.1 FAULT-FINDING TABLE
COMPLAINT: LOOSE U-BOLTS
Possible cause
Remedy
Use of a U-bolt or nut of an incorrect property
class.
Use U-bolts and nuts of the correct property
class.
The tightening torque used for the U-bolt nut
was too low.
Tighten the U-bolt to the specified torque.
Reuse of a U-bolt with corroded or damaged
thread.
Fit new U-bolt.
No or inadequate cleaning of the thread (which
includes removal of paint) before reuse of the
U-bolt.
Clean the thread thoroughly before re-use.
No oil or faulty application of oil on the thread
and the bearing surface of the nut.
Apply the oil as prescribed.
Coating (i.e. paint) on the contact faces of the
connection.
Clean the contact faces before assembly.
Inadequate retorquing of the U-bolt nut or no
retorquing.
Tighten the U-bolt nut as specified.
COMPLAINT: BROKEN SPRING
Possible cause
Remedy
Regular overloading.
Adjust vehicle loading.
Driving too fast over bad roads.
Adjust speed when the road is bad.
Notching effect due to welding or grinding
activities.
Cover spring assembly when welding or
grinding.
Spring damaged due to impact of a steel
hammer.
Never hit the springs using a steel hammer or
some other hard tool.
Incorrect repair of a spring leaf which has broken
before.
When replacing a broken spring leaf, always
replace the leaf on top and under the broken
leaf; better yet, replace the entire spring
assembly.
Spring has been heated.
Replace spring assembly. Springs should never
be heated.
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