Adjustments And Servicing Procedures; Adjustment Of The Continuous Regulating System - Atlas Copco XA186 Dd Instruction Manual

5.

ADJUSTMENTS AND SERVICING PROCEDURES

5.1 A
DJUSTMENT OF THE CONTINUOUS REGULATING SYSTEM
LV
OS
AR
AOV
MPV NRV
Fig. 5.1
The working pressure is determined by the tension of the spring in
the regulating valve (RV). This tension can be increased to raise the
pressure and decreased to lower it 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 3.3).
2. With the outlet valves (AOV) closed, loosen the regulating
valveÕs lock nut and adjust the regulating valve (RV) until a
pressure of X bar(e) is reached (see tabel).
3. Check the minimum speed of the engine. Adjust minimum speed
stop screw if necessary.
4. Open an outlet valve (AOV) just enough to let the engine (E) run
at maximum speed. The working pressure must be Y bar(e);
adjust if necessary with regulating valve (RV) (see tabel).
AF
CE
VV
PG
RV
FR
SV
UV
UA
VH
BDV
SL
CV
OF
FP
SL
OLG
DP
VI
AF
E
VV
SR
BOV
CH
CE
TS
DP
Tabel
X
bar
XA(S) 8.3
XATS 12
XAHS 13.4
XAVS 15.5
5. Check the engine maximum speed. Adjust the maximum speed
by means of adjusting eccentric nut on top of speed regulator
(SR).
6. Close the outlet valves (AOV), check that the pressure is between
Z1 and Z2 bar(e) (see tabel). Lock the regulating valve (RV) by
fixing the lock nut.
I
NSTRUCTION
VI
E OC
F
DP
Y Z1 Ð Z2
bar bar bar
7 8.1 Ð 8.5
10.3 11.7Ð 12.2
12 13.2Ð 13.6
14 15.3Ð 15.7
M
ANUAL
21