icestationzebra
Senior Member
Sky Trak 5028 is a very weak power wise with a NA cummins. The transmission is a C6 I think. You would be much happier with a 6036 or 6042.
As far as the LULL 644, Barklee didn't mention if he meant 644B, 644D or 644E. The 644B has about 85% commonality with the 844C so it is overbuilt. Visibility to the rear is limited. The 644D is a handy little machine but it does have weak gearboxes and gets rust in the fuel tank. A side engine machine with good visibility. This is the lightest of the three mentioned with the least produced, so it will be the cheapest. The 644E has 85% common with the 944E so it is overbuilt. Another side engine, but with a high boom, so it has excellent visibility. If you find a 644K it is the same as a 644B without transaction, though it can be converted with the addition of the cylinder, rollers and a valve section.
Gehl and Mustang are identical machines, formerly Dynalift. Very heavy built, not the best visibility. Fairly simple design except the newer 519.
Terex/Square Shooter - I believe Terex bought the design from Hyster. Old school design, very basic.
Rollers are old school design, before UHMW nylon was easy to get. Rollers aren't as good since they point load the boom box, need grease, and require a taller boom. Pads do wear out, but of more concern is that they should be shimmed as they wear to keep the boom tight. I know that Lull and Sky Trak have a champher on the pads as a wear indicator, when the champher is gone change the pads. Otherwise you wear wear down to the bolts and trash the boom.
ISZ
As far as the LULL 644, Barklee didn't mention if he meant 644B, 644D or 644E. The 644B has about 85% commonality with the 844C so it is overbuilt. Visibility to the rear is limited. The 644D is a handy little machine but it does have weak gearboxes and gets rust in the fuel tank. A side engine machine with good visibility. This is the lightest of the three mentioned with the least produced, so it will be the cheapest. The 644E has 85% common with the 944E so it is overbuilt. Another side engine, but with a high boom, so it has excellent visibility. If you find a 644K it is the same as a 644B without transaction, though it can be converted with the addition of the cylinder, rollers and a valve section.
Gehl and Mustang are identical machines, formerly Dynalift. Very heavy built, not the best visibility. Fairly simple design except the newer 519.
Terex/Square Shooter - I believe Terex bought the design from Hyster. Old school design, very basic.
Rollers are old school design, before UHMW nylon was easy to get. Rollers aren't as good since they point load the boom box, need grease, and require a taller boom. Pads do wear out, but of more concern is that they should be shimmed as they wear to keep the boom tight. I know that Lull and Sky Trak have a champher on the pads as a wear indicator, when the champher is gone change the pads. Otherwise you wear wear down to the bolts and trash the boom.
ISZ
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