9. FAULT
DIAGNOSIS
Symptom
Possible Cause
Remedy
Page Ref
Tool will not place
fastener
Low air pressure.
Increase air pressure
Lack of lubrication.
Lubricate tool at air inlet point
High broach load.
Check fastener grip and application hole
size
Check for correct size mandrel.
Worn or broken tail jaws.
New tail jaws
Tail jaws switched off .
Switch on tail jaws
Air in hydraulic system.
See ‘Priming Procedure’
25
‘Mandrel Slip’ - jaws
will not grip mandrel
Worn or dirty tail jaws.
Clean or renew as necessary
Insuffi
cient air pressure/volume.
Increase air pressure/volume
Tail jaw switch inoperable.
Replace switch
Air leaks to tail jaws.
Renew ‘O’ rings on piston 8
Mandrel broken and not reaching tail
jaws.
Replace mandrel
Defective non-return valve.
Replace non-return valve
Jaws will not release
mandrel
Dirty tail jaws or jaw housing.
Clean and lubricate
Faulty tail jaw switch.
Replace ‘O’ rings
Fasteners will not feed
through nose jaws
Tail jaws not switched on.
Switch on tail jaws
Worn tail jaws.
Renew tail jaws
Cursor orientation incorrect.
Refi t, ensuring correct orientation
Incorrect nose jaws.
Fit correct nose jaws
Mandrel follower spring not fi tted.
Fit correct mandrel follower spring
Incorrect gap between fastener head
and nose jaws when loaded.
Set gap to 1.5mm - 3mm (1/16” - 1/8”)
See ‘Loading the Tool’
9-10
Cursor sticking.
Clean and oil cursor
Weak outer spring around cursor.
Renew cursor
Incorrect mandrel follower spring fi tted. Fit correct mandrel follower spring
Excessive tail jaw wear
High broach load.
Check application hole size and thickness
and fastener grip capability
Feeding more than
one fastener at a time
Mandrel slip.
Check as for ‘Mandrel Slip’, above
Incorrect gap between fastener head
and nose jaws when loaded
Set gap to 1.5mm - 3mm (1/16” - 1/8”)
See ‘Loading the Tool’
9-10
Item numbers in
bold
refer to the general assemblies and parts lists pages 26-27.
Other symptoms or failures should be reported to your local Avdel authorised distributor or repair centre.
E N G L I S H O R I G I N A L
I N S T R U C T I O N
26