S508
26” Electric Bicycle
©2019 MONSTERPRO
20
Troubleshooting
Malfunction
Possible Cause
Possible Solution
Pedal assistance not
working
1.
Under-charged battery.
2.
Battery no longer serviceable.
3.
Battery charger faulty.
4.
Motor electrics or switches damaged
/ faulty.
1.
Charge battery. Follow battery care procedures.
2.
Have battery checked. Replace if faulty.
3.
Have charger checked. Replace if faulty.
4.
Seek diagnosis and repair from authorised
service centre.
Reduced range and/or
speed
1.
Under-charged battery.
2.
Battery no longer serviceable.
3.
Low tyre pressure.
4.
Brakes dragging.
5.
Terrain, headwind, etc.
1.
Charge battery. Follow battery care procedures.
2.
Have battery checked. Replace if faulty.
3.
Inflate to recommended pressure.
4.
Adjust.
5.
Normal.
Gear change (where
applicable) rough /
not changing
1.
Derailleur cables sticking /
stretched / damaged.
2.
Derailleurs / shifter not correctly set.
1.
Lubricate / adjust / replace cables.
2.
Adjust.
Chain slip / jumping
off sprockets
1.
Worn sprockets.
2.
Stretched chain.
3.
Front sprocket loose / out of true.
4.
Sprocket teeth bent / broken.
5.
Derailleur / shifter not
correctly adjusted.
1.
Replace.
2.
Replace.
3.
Re-true / tighten.
4.
Replace.
5.
Adjust.
Clicking noises when
pedaling
1.
Stiff chain link.
2.
Loose pedals / bearings.
3.
Loose bottom bracket / bearings.
4.
Bent bottom bracket or pedal bolt.
5.
Loose pedal arm bolts.
1.
Lubricate chain.
2.
Tighten / adjust bearings.
3.
Tighten / adjust bearings.
4.
Replace.
5.
Tighten.
Grinding noise when
pedaling
1.
Pedal bearings too tight.
2.
Bottom bracket bearings too tight.
3.
Rear wheel not straight.
4.
Chain too tight.
5.
Derailleur dirty.
1.
Adjust.
2.
Adjust.
3.
Align so chain straight.
4.
Adjust.
5.
Clean and lubricate.
Brakes not effective
1.
Pads worn.
2.
Pads / discs dirty.
3.
Brake cables binding /
stretched / damaged.
4.
Brakes levers binding.
5.
Brakes require adjustment.
1.
Replace.
2.
Clean and degrease.
3.
Lubricate / adjust / replace cables.
4.
Clean pivots.
5.
Adjust.
Brakes squeal
1.
Pads / discs dirty.
2.
Brakes not centred.
3.
Caliper fasteners loose.
1.
Clean and degrease.
2.
Centre brakes and adjust.
3.
Tighten.
Brakes chatter / vibrate
1.
Brake mounting bolts loose.
2.
Brakes out of adjustment.
3.
Steering head bearings loose.
1.
Tighten.
2.
Centre brakes and adjust.
3.
Adjust bearings.
Wheel vibration / wobble
1.
Axle bent or broken.
2.
Wheel out of true.
3.
Wheel hub bearings loose /
not serviceable.
4.
Quick-release (if equipped)
mechanism loose.
1.
Replace.
2.
True wheel.
3.
Adjust / replace.
4.
Adjust.
Steering not accurate
1.
Wheels not aligned to frame.
2.
Steering head loose / binding.
1.
Align wheels.
2.
Adjust.
