Getting a Trailer Center Cap A trailer center cap keeps dirt as well as debris far from the lug nuts on your steel wheels. Without them, the studs can corrosion and wreck their threads over time. Keeping them clean also allows you to transform your trailer wheels simpler, which is especially important if you use your trailer for offroad travel. There are several type of center caps readily available, and some don’t fit all kind of wheels. Before buying one, consider your make and design, along with the stud size of your trailer wheels. Dirt caps are one of the most standard kind of bearing protectors, and if you look around any boat ramp it’s most likely that half the trailers have them. They’re economical, yet they can get filthy in a hurry and strike off under some problems. Some specialists suggest using them, however others highly suggest getting an extra pricey type of hub guard (see below). There are several methods to keep your dirt cap in place, however a common technique is to add a thin layer of grease with a hand oil gun on the inside of the trailer wheel. This makes the wheel’s studs stick out as well as holds the cap in position, yet it’s not an excellent concept to exaggerate the grease. Way too much can put pressure on the real seal and also cause it to blow off. The various other reason that dirt caps come off is that they’re frequently removed to check or service the wheel bearings as well as do not stab in the back properly. There are tales of wedge pins or castle nuts sliding while being re-installed, and also the cap can obtain knocked off in the process. Some experts suggest putting the cap on very first, then raising the trailer and tapping it with a wood block and a hammer. This helps to disperse the pressure of reinstallation and also set the cap equally. Numerous professionals are likewise not on board with the oil-filled hubs found on a number of boat trailers. They say the oil will certainly work out, with gravity, versus the lower fifty percent of the hub assembly and leave the upper half prone to contamination by water. They likewise say that the oil will not stay on the studs as properly as grease and also can spill off the studs while driving.