GRAUPNER heim UNI-Mechanik 2000 Mode D'emploi page 62

The motor's power is transmitted from the crankshaft to the clutch entirely by means of the
pressure exerted by the split taper collet on the ground crankshaft, and by the tapered socket
on the clutch. For this reason it makes sense to fit the clutch first, without the fan, and tighten it
really firmly; you will need to use a suitable tool to hold the clutch securely.
When fitting the clutch bell on the crankshaft it is essential that the shaft should not be pushed
back in its bearings!
Once the clutch is tightened correctly, you will not be able to remove it, even after removing the
crankshaft nut, unless you use a puller tool (Order No. 4448.26),
In fact, the crankshaft nut does not contribute significantly to the power transmission system; its
primary purpose is to secure the cooling fan. For this reason you don't need to worry if the
crankshaft nut can only be fitted half-way onto the threads, for example, if you use the hexagon
starter cone (Order No. 4448.103) in conjunction with the earlier type of taller clutch pinion: this
is still sufficient to secure the fan and starter cone safely. If you use the hexagon starter adaptor
you may find that the fan eventually starts to foul the fan housing at the bottom; if this should
happen, fit a suitable washer between the clutch and the cooling fan.
Motor Reduction
OS MAX 61
SX/RX-HGL"C"
Order No. 1890 / 1892
OS MAX 61
LX / SF / RF 10:1
Order No. 1919
OS MAX 91
FX 7,7:1
Order No. 1816
OS MAX 91
FX / SX-HGL 7,7:1
Order No. 1922, 1935
OS MAX 91
FX / SX-HGL 10:1
Order No. 1922, 1935
Motor without
HEIM crankshaft
Motor without
HEIM crankshaft 10:1
Summary of motors / clutches / gears
Clutch bell
ratio
4448.124
9:1
4448.122
4448.126
4448.126A
4448.122
1239
9:1
4618.23A
UNI-Mechanics 2000
Replacement Taper collet
pinion
4448.224 4448.77
4448.222 4448.77
4448.226 4448.77A
4448.226A 4448.77
4448.222 4448.77
- 4618.77 od.
4618.22
- 4618.77 od.
4618.22
16
Centrifugal Spur gear
element
4448.79 4448.107
4448.79 4448.107
4448.79A 4448.107B
4448.79A 4448.107B
4448.79A 4448.107
4618.24 4448.107
4618.24 4448.107