HEN THE GREASE IN FARM MACHINERY FAILS, an already tough job gets tougher. Don Smith,
owner of Smith Repair in Fredricksburg, Iowa, helps solve grease failure problems for
his customers with AMSOIL Heavy Duty Metal Protector.
"One job that's showing up more and more often these days are rebuilds on 5th wheel
hitches," Smith said. "More farmers now use semi-tractors and grain trailers to move
grain. Most of these farmers run their trucks on gravel roads. When the time comes to
unhook the trailer, many find the 5th wheel very hard to unlatch."
That's because the grease in the latching mechanism on the underside of the 5th wheel
plate absorbs the road dust, Smith explained. "The grease gets very gummy and the latch
is frustrating to unhook," he said. "I've come up with a method of lubricating 5th
wheels that virtually eliminates this problem and makes trailers much easier to unhitch."
After rebuilding a 5th wheel plate, Smith flips it over onto a sheet of cardboard
and sprays the locking mechanism thoroughly with three coats of AMSOIL Heavy Duty Metal
Protector. AMSOIL Heavy Duty Metal Protector is in an aerosol can and sprays out as a
liquid. It dries to a waxy lubricating film that does not attract dust.
"I apply three coats, allowing each coat to dry," Smith said. "Once applied, my
farmer customers tell me the 5th wheel plate no longer gums up. It's important to
thoroughly clean the plate before applying."
But the MPHD is only half the cure for the problem, he said. Greasing the top of
the plate causes the grease to be pushed into the kingpin and back into the latch
To remedy the problem of overgreasing, Smith uses AMSOIL 5th Wheel and Open Gear
Compound. It also comes in an aerosol can. "This synthetic 5th wheel spray grease is
very neat and easy to apply," Smith said. It leaves behind a thin tenacious film that
will not wash off or be pushed off the way grease can be." One can of the 5th wheel
grease will last up to four applications, depending on how liberally it is applied.
"In my work, I've found that these two products applied to a 5th wheel hitch greatly
reduce problems hooking and unhooking," Smith said. "I also use the AMSOIL MPHD as a
chain lube, on door hinges, grain trailer door slided, etc. Because it locks out oxygen
and won't wash off, it also helps prevent corrosion."