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Adjustments and servicing procedures
ADJUSTMENT OF THE CONTINUOUS REGULATING SYSTEM
The working pressure is determined by the tension of
the spring in the regulating valve (1). This tension can
be increased to raise the pressure and decreased by
turning the adjusting wheel clockwise and anti-
clockwise respectively.
To adjust the normal working pressure, proceed as
follows:
1. Start and warm up the engine (see section
Starting/Stopping).
2. With the outlet valves (2) closed, loosen the
regulating valve’s lock nut and adjust the
regulating valve (1) until a pressure of X bar is
reached (see table).
3. Check the minimum speed of the engine. Adjust
minimum speed stop screw if necessary.
4. Open an outlet valve (2) sufficiently to let the
engine run at maximum speed. The working
pressure must be Y bar; adjust if necessary with
regulating valve (1) (see table).
5. Check the engine maximum speed.
6. Close the outlet valves (2), check that the pressure
is between Z1 and Z2 bar (see table). Lock the
regulating valve (1) by fixing the lock nut.
X Y Z1 – Z2
XAHS 146 bar 13.5 12 13.2 – 13.6
psi 196 174 191.5 – 197.5
XATS 156 bar 11.8 10.3 11.7 – 12.2
psi 171 149 167 – 173
XAS 186 bar 8.3 7 8.1 – 8.5
psi 120.5 101.5 117.5 – 123.5
XAVS 166 bar 15.5 14 15.3 – 15.7
psi 225 203 219 – 227
XAHS 186 bar 13.5 12 13.3 – 13.7
psi 196 174 191.5 – 197.5
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