Sutphen SL75 - Rotation Gear Reducer; Drive Gears; Tower Extension;Retraction Cylinder (Model SL75 only)

SUTPHEN TOWERS, INC. 2012
Manual-2012 _SL75-SA75-SP70.docx Page 26 of 55 8/31/2012
At this time, we recommend all bolts attaching the turntable to the bearing,
and all bolts attaching the bearing to the main frame (where applicable) be
checked for tightness. SEE TURNTABLE ATTACHMENTS, page 40.
ROTATION GEAR REDUCER
This device rotates the turntable and tower assembly. It is attached to the lower assembly,
below the gear, on the left side of the assembly.
It is driven by a hydraulic motor, directly attached to the high speed worm gear shaft. No
lubrication is required for the hydraulic motor. On the main gear case, there are three (3)
plugs, located on the right hand outboard side. The top plug is the oil fill vent plug. The one on
the side is the fill level plug. The bottom one is the drain plug.
Under normal tower operation conditions, the lube oil in this gear reducer needs to be changed
three (3) months after the delivery date of the tower. Thereafter, lube oil needs to be changed
every 12 months (average 4 hours per day operation). Never over fill the unit. Check oil level
every three (3) months. Use a good grade of 140 weight gear lube oil. At the upper portion of
the main gear case, there is a grease fitting. This fitting needs to be greased every 25 hours of
operations, or annually, with a good grade of EP bearing grease.
There are three (3) plugs on the primary rotation gear housing. The one on top (1/4") is the
filler-breather plug. The one on the side (1/4") is the lube level plug. The one in the bottom of
the high speed gear housing (1/4") is the drain plug.
Maintain oil level to Oil Level plug. Check oil level every three (3) months. Use a good grade of
140 weight gear lube oil.
Access to the rotation gear reducer is gained by removing the inspection
plate, located in the turntable stairway.
DRIVE GEARS
The drive pinion gear and the turntable bearing gear are lubricated with a special elastic lube,
designed to endure the life of the unit.
TOWER EXTENSION/RETRACTION CYLINDER (Model SL75 only)
Located on each side of the ladder base section, is a cylinder which extends and retracts the
ladder assembly. There are two points on each of these cylinders that require lubrication. One
is at the base end, nearest the turntable, the other is at the tip end, where the rod eye attaches
to the next section. These need to be lubricated two (2) times a year. Use multi-purpose
grease. At each end of the cylinder, there are bolts attaching the cylinder to the tower. These