BPW’s double-deck inspection tips
BPW has released guidance for maintenance providers on the inspection and servicing of double-deck trailers.
“Double-deck trailers often require more time to carry out routine inspections correctly,” explained the firm.
“This is due to the demanding nature of the work they carry out. Often running at night on motorways, these trailers do high mileage and minimal braking, meaning more care and attention is required when servicing the running gear.”
Good access to the underside of a trailer is vital, advises BPW.
“Due to the height between a trailer and the ground, it is often difficult to fit underneath a trailer on flat ground. BPW recommends that low running trailers are serviced and maintained whilst over a pit or on ramps; this gives a technician good all round access to carry out a service correctly.
“All hubs should be checked for excessive end float or any other defects. This requires the axle to be lifted off the ground and the hubs rotated to listen out for any rumbling or grinding noises. End float checks should be done on every service; if the same hub requires adjusting each service, further investigation is required.
“When adjusting drum brakes, the axle must be lifted, the brake wound on to a bind and backed off 180°. Less than 180° will cause the brake to run hot.”
Tyre pressures must be checked, the company emphasises.
“An underinflated inner tyre will cause uneven pressure on the wheel bearings and cause premature wear; this may result in a bearing failure.
“If the vehicle is fitted with ‘N-Series’ hubs (brake size 300×200), the wear limit on the brake linings is 7mm.
“If the vehicle is fitted with a steering axle, the king pins must be greased every six weeks with the correct BPW grease to prevent premature wear. This requires the axle to be lifted and steered fully both ways to allow the grease to completely cover the king pins.
“Camshafts and slack adjusters must be greased using the correct specification BPW grease on every service during the warranty period. If non-BPW grease is mixed with BPW grease, this will cause them to congeal and block the greaseways.”
