| SYMPTOM |
PROBABLE CAUSE |
REMEDY |
| ELONGATED HOLES FRACTURED PLATE FRACTURED PINS |
- OVERLOAD ABOVE CHAIN BREAKING LOAD
|
- INVESTIGATE FOR FOREIGN OBJECTS CAUSING JAMS
- PROTECT CHAIN WITH OVERLOAD DEVICE
- REVIEW LOADING
|
| FRACTURED BUSHES |
- SPEED TOO HIGH FOR PITCH
- HEAVY SHOCK LOAD APPLIED
- CORROSION PITTING
|
- CHAIN OF SHORTER PITCH BUT EQUIVALENT STRENGTH
- INVESTIGATE ON-LOADING IN ATTEMPT TO MINIMISE SHOCK
- CONSIDER SPECIAL MATERIALS OR IMPROVE LUBRICATION
|
| EXCESSIVE WEAR IN THE ROLLER BORE |
- HIGH UNIT LOAD
- TWISTED SLATS OR CARRIERS
- PACKING OF ABRASIVE PARTICLES
- UNSATISFACTORY ROLLER BORE LUBRICATION AND CORROSION
|
- DISTRIBUTE LOAD ALTER PITCH
- RECTIFY & CHECK FOR FLATNESS.
- MINIMISE CHAIN/MATERIAL CONTACT CONSIDER CHAIN AS PULLING MEDIUM ONLY
- IMPROVE LUBRICATION; CHANGE TO GREASE GUN DESIGN IF POSSIBLE
|
| ROLLER FLATTENING DUE TO SKIDDING |
- TOO LIGHTLY LOADED
- SYSTEM HEAVY LOAD WHERE FRICTION BETWEEN BUSH AND ROLLER BORE OVERCOMES LEVER EFFECT OF FRICTION AT ROLLER PERIPHERY
- EXCESSIVE LUBRICANT ON TRACK
- CANTING OF CHAIN DUE TO LOAD
|
- INCREASE LOAD WITHIN LIMITS OF CHAIN
- INCREASE CHAIN SIZE IF NO LOAD REDUCTION POSSIBLE
- CLEAN AND SCOUR
- TRACK STRENGTHEN CARRYING MEDIUM
|
| LOOSE OR DAMAGED ATTACHMENTS |
- HIGH UNIT SHOCK LOADING
- INCORRECT SLAT OR CARRIER ASSEMBLY
- TWISTED CHAIN CAUSING FLEXURE OF PLATFORM BY CONTINUAL SLAT OR CARRIER MOVEMENT
|
- MINIMISE SHOCK BY MODIFYING LOADING SEQUENCE
- RE-ALIGN TO ENSURE CORRECT PHASING OF CHAINS
- EMPHASISE CARE AT ASSEMBLY STAGE IN MOVEMENT OF HANDLING LENGTHS
|
| TIGHT CHAIN JOINTS |
- MATERIAL PACKED IN CHAIN
- MATERIAL FROZEN IN JOINTS
- INCORRECT LUBRICATION (GUMMY)
- CORROSION
- MALALIGNMENT
- PLATE MOVEMENT AFTER BUSH TURNING IN HOLES
|
- CLEAN AND RE-LUBRICATE
- REDUCE CHAIN/MATERIAL CONTACT. RUN CONTINUOUSLY
- CLEAN AND LUBRICATE WITH CORRECT TYPE OF LUBRICANT
- INVESTIGATE CAUSE AND CONSIDER SPECIAL MATERIALS
- CHECK ALIGNMENT OF STRUCTURE
- IMPROVE PIN/BUSH LUBRICATION
- ADJUST CORRECTLY
|
| CHAIN CLIMBS SPROCKET |
- EXCESSIVE TOOTH WEAR
- BUILD-UP OF EXCESSIVE SLACK
- CHAIN ELONGATION
- SEVERE OVERLOADS
- MATERIAL PACKING BETWEEN CHAIN AND SPROCKETS
- HEAVY LOAD CARRIED UNDER SPROCKET
|
- REPLACE SPROCKETS
- ADJUST CHAIN CORRECTLY
- REPLACE CHAIN
- REDUCE LOADING - STRENGTHEN
- CARRIERS CONSIDER SPECIAL TOOTH FORM
- RELIEVED TEETH
- CONSTRAIN CHAIN AROUND
|
| CHAIN CLINGS TO SPROCKET |
- INCORRECT TOOTH FORM
- WORN TOOTH FORM
- HEAVY AND TACKY LUBRICANTS
- STIFF CHAIN JOINTS
|
- REPLACE
- REVERSE SPROCKETS
- CLEAN AND RE-LUBRICATE
- SEE "TIGHT CHAIN JOINTS"
|
| CHAIN WHIP |
- EXCESSIVE SLACK
- LONG CENTRES WITH PERIODIC
- ON-LOADING OF MATERIAL
- CAUSING PULSATING ACTION
|
- FULLY GUIDE RETURN STRAND
|
| UNEVEN RUNNING |
- HEAVY LOAD AND LOW SPEED CAUSING ROLLERS TO "STICK SLIP"
- VERY LIGHT LOAD AND LUBRICANT ON TRACK CAUSING ROLLERS TO "STICK SLIP"
- POLYGONAL ACTION OF CLOSELY SPACED WHEELS IN COMPLEX CIRCUIT
- HIGH FRICTION OF IDLER SPROCKETS
- POLYGONAL ACTION ON SPROCKETS
|
- SEE "ROLLER FLATTENING". CONSIDER ADDITIONAL DRIVE POINT. CHECK SURGE AT DRIVE DUE TO INADEQUATE POWER RESERVE OR SHAFT/BEARING RIGIDITY
- GUIDES TO BE CLEANED TO REMOVE EXCESS LUBRICANT AND CHAIN LUBRICATED ON ROUND PART CONTACT POINTS ONLY
- INCREASE SPROCKET CENTRES OR REPOSITION SPROCKETS
- LUBRICATE CORRECTLY OR FIT LOW FRICTION BEARINGS
- INTRODUCE SPROCKETS WITH A LARGER NUMBER OF TEETH
|
| EXCESSIVE NOISE |
- MALALIGNMENT OF TRACK JOINTS
- TOO LITTLE OR TOO MUCH SLACK
- HIGH SPEED
- CHAIN OR SPROCKETS WORN
- INEFFECTIVE LUBRICATION
- INCORRECT POSITIONING OF GUIDE TRACKS ADJACENT TO SPROCKETS
|
- CHECK ALIGNMENT OF STRUCTURE
- ADJUST CORRECTLY
- CONSIDER SHORTER PITCH
- REPLACE
- LUBRICATE
- REPOSITION
|