Adjustments And Servicing Procedures; Adjustment Of The Continuous Regulating System - Atlas Copco XAHS 146 Dd S3B APP Instruction Manual

Adjustments and servicing procedures

ADJUSTMENT OF THE CONTINUOUS REGULATING SYSTEM

(1)
(2)
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.
XAHS 146 bar
psi
XATS 156 bar
psi
XAS 186 bar
psi
XAVS 166 bar
psi
XAHS 186 bar
psi
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.
- 69 -
X Y
13.5 12
196 174
11.8 10.3
171 149
8.3 7
120.5 101.5
15.5 14
225 203
13.5 12
196 174
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.
Z1 – Z2
13.2 – 13.6
191.5 – 197.5
11.7 – 12.2
167 – 173
8.1 – 8.5
117.5 – 123.5
15.3 – 15.7
219 – 227
13.3 – 13.7
191.5 – 197.5