Mahirap gumawa ng diagnosis batay sa ingay lamang. Ang video na ito ay itinataguyod ng BCA Bearings ng NTN.
Pinagsasama-sama ng serye ng video ng BCA Hub ang pinakabagong mga tip sa video tech sa mga wheel hub, bearings, at seal, na nagtatampok sa mga ekspertong pinagkakatiwalaan mo. Inihatid sa iyo ng BCA Bearings ng NTN. Matuto pa sa bcabearings.com.
Ang klasikong sintomas ng masamang wheel bearing ay karaniwang isang paikot na huni, tili, o ungol na ingay na nagbabago proporsyonal sa bilis ng sasakyan. Ang tunog ay maaaring mawala sa ilang bilis o mangyari lamang sa ilang partikular na bilis. Maaaring lumala ang ingay kapag lumiko, o maaaring mawala ito sandali. Kaya mahirap gumawa ng diagnosis batay sa ingay lamang. Ang mga bahagi tulad ng mga gulong, CB joint at preno ay maaaring gayahin ang ingay ng tindig ng gulong. Ito ang dahilan kung bakit ang pakikipanayam sa customer, pagpunta para sa isang test drive at pagsasagawa ng isang mahigpit na visual na inspeksyon ay kritikal sa pagresolba sa reklamo ng customer.
Ang ingay kaya sa mga gulong? Ang ingay ng gulong ay palaging proporsyonal sa bilis ng sasakyan. Ang ingay na nabuo ng isang gulong ay maaaring sanhi ng hindi pantay na pattern ng pagtapak, pagkakagawa ng gulong, at maging ang kawalan ng timbang ng gulong. Ito ay kadalasang dahil sa mga nawawalang pag-ikot ng gulong o sa ilang mga bihirang kaso, isang shifted belt o isang nasira na construction. Biswal na siyasatin ang gulong at patakbuhin ang iyong mga kamay sa ibabaw ng tread ng gulong upang makita ang hindi pantay na mga bloke o balahibo ng panloob o panlabas na mga balikat ng gulong. Paikutin ang gulong at hanapin ang labis na radial na maubusan gamit ang iyong mata kung maaari.
Ang pagpupulong ng gulong at gulong ay maaaring magkaroon ng mga isyu sa balanse na maaaring magdulot ng ingay na proporsyonal sa bilis ng sasakyan. Kung makakita ka ng gulong na kulang sa bigat ng gulong, maaari itong static o dynamic na isyu sa balanse. Ang iyong pinakamahusay na mapagpipilian ay ang gumamit ng balancer at tingnan kung gaano kalala ang kawalan ng timbang. Gayundin sa isang balancer, maaari mong sukatin ang rim run out. Kung ang pagpupulong ng gulong ay may mataas na puwesto, habang ang lugar ay nakikipag-ugnayan sa kalsada, magbubunga ito ng ingay na proporsyonal sa bilis ng sasakyan.
What about the brakes? A caliper that is sticking or a brake pad that is loose and dragging may make a metallic scraping noise as it rubs against the brake rotor or dust shield. The frequency of the noise will also change proportional to vehicle speed, but will often go away or change when the brakes are lightly applied. Noise that occurs only when the driver is braking likely is a brake problem such as worn pads and not a bad wheel bearing.
What about a CV joint? A popping or clicking noise when turning is a classic symptom of a bad outer CV joint. The noise will also increase as the steering angle is increased. Also note the condition of a CV joint boot. If it is torn or leaking, the boot should be replaced regardless of the state of the joint. If the CV joint is noisy, it will need to be replaced.
What about play in the bearing and flange? Raise the vehicle so the wheel is off the ground and then grab at the 12 and six o’clock positions and rock the tire back and forth. As a rule, you should not feel any play or looseness if the vehicle has a sealed wheel bearing cartridge or hubs with a sealed wheel bearing assembly. A little play is normal on older vehicles with serviceable wheel bearings, but a lot of play is not. Refer to the vehicles service specifications for the maximum amount of acceptable play. Wheel bearing play can be measured with a dial indicator by placing the dial indicator against the wheel flange and rocking it back and forth and in and out by hand. As a rule, you should see no more than five thousandths of an inch of run out if the bearings are good.
What about the road surface? Bearing noise should never be intermittent, but the noise can change due to the harmonics and how the driver hears the road noise due to the road surface. This is why the customer interview is so important. Ask the customer what does the noise sound like? When does the noise occur? What speed does the noise occur? Does the noise change when breaking or turning? You should not interrupt the customer or try to diagnose the problem noise during the interview. Always take notes. If you just write on the repair order, “Customer states they hear wheel bearing noise” or “Check for wheel bearing noise”, you’re probably not going to get a proper diagnosis, and this will typically lead to an unhappy customer and an even unhappy technician. I’m Andrew Markel. Thank you very much.
(https://www.brakeandfrontend.com)
More about VAFEM:
VAFEM is devoted to providing high quality ball & roller bearings and related transmission parts for domestic and foreign customers in the Vehicle industry and Industries. Our products used in automotive and truck industry mainly include : wheel bearings, wheel bearing kits, wheel hub bearings, alternator bearings, tensioner bearings, clutch bearings, and gear box bearings etc. Our industrial bearings are mainly used in these fields such as Industrial Automation, Home Appliances, Reducers, Agricultural Machines, Precision Machine Spindles, and Transmission Systems etc. As a high-tech company specializing in bearings, we can not only provide stable and trustworthy quality products for OEM customers, but also provide non-standard bearings based on customers’ special requirements. At the same time, we can provide a series of complete product lines and have our own brand VAFEM, it stands for the abbreviation of value added for every movement, which has been recognized by more and more customers and end users.
2023 New Week VAFEM product Recommendation:
Agricultural machinery requires better seals for contaminated conditions, provisions for misalignment, and economical mountings for shafts and housings. VAFEM offers bearings for disc harrows, planters, mowers, rakes, all types of balers, tillage, seeding and forage harvester equipment, combines, cotton pickers/stripers, and other agricultural equipment like silo unloaders and grain elevators.
Nag-aalok din kami ng kumpletong linya ng insert ball bearings, shaft mount na may alinman sa tapered adapters o locking collar o set screws. Kasama sa aming mga napatunayang disenyo ng selyo ang mga mababang torque na kalasag hanggang sa mabibigat na triple lip seal. Available din ang mga disc harrow bearings na may alinman sa bilog, parisukat, o hexagonal na mga butas. Ang lahat ng mga bearings ay magagamit na mayroon o walang re-lubrication hole.
https://www.vafem.com/products/Agricultural-Bearings/775.html
2023-08-04