Onan NHC Series Operator's/Service Manual And Parts Catalog page 11

The fuel supply tank may be installed in any safe,
convenient location. If the tank is installed within the
engine enclosure, provide a vent line to the outside of
the enclosure.
The installation of a fuel filter between the fuel tank
Snd the fuel pump is'recommended. The fuel filter
should be fitted with a shutoff valve and should be
easily accessible for cleaning.
CONNECTING TO THE LOAD
The dimensions of various power takeoff shafts are as
follows:
SHAFT
DIAMETER LENGTH
KEY SIZE
STD
1-7/16
3-1/16 3/8
Rockford Clutch
1-7/16
3.-1/16 3/8
Gear Reduction 1-1/4
2-3/4- 1/4
Belt Drive: V-belts are preferable to flat belts. Consult
a reliable belting supplier for recommendations
regarding size of pulleys, number of belts, etc.
required. A typical belt drive installation is shown in
Figure 3.
KEEP SHAFTS OF ENGINE
AND LOAD P A R A L L E L .
B E L T IN TIGHTENED
POSITION - P U L L I N G
LOAD
ENGINE
PULLEY
B E L T IN LOOSENED
POSITION - NOT
PULLING LOAD-
KEEP PULLEYS ALfGNEt
WITH EACH OTHER
IDLER PULLEY
LOAD
PULLEY
BRACKET TO KEEP
B E L T OFF ENGINE
PULLEY
FIGURE 3. DRIVE BELT INSTALLATION
Comply with the following installation requirements:
1. The.shafts of the engine and the load must be
parallel with each other.
2. The pulleys of the engine and the load must be in
alignment.
3. Mount.the engine pulleys as close to the engine as
possible.
4. If the installation permits, belts should run
horizontally.
5. Some method'of disconnecting the load for
starting is recommended. If a clutch is not used, a
belt-tightener idler arrangement can be used.
Flexible Coupling:^lf a flexible coupling engine-to-
load drive is used, the load shaft must be in line and
centered with-the engine shaft (Figure 4).
ENGINE POWER
T A K E - O F F ^
SHAFT
F L E X I B L E
COUPLING
FIGURE 4. FLEXIBLE COUPLING
Reduction Gear Drive: Reduction gear drives are
mounted at the factory (when ordered). The method
of connecting the load is the same as when connec-
ting directly to the engine shaft.
Clutch Installation: A Rockford Clutch can be in-
stalled at the factory or in the field. Install the clutch
according to the following instructions and Figure 5.
KEYWAY
DRILL 13/64" H O L E '
1/8" DEEP
CRANKSHAFT STUB SHAFT
CLUTCH CLUTCH
ASSEMBLY HOUSjNG
I 1/32"
A867
SET SCREW
POWER
T A K E - O F F
SHAFT
FIGURE 5. CLUTCH INSTALLATION