Nominal Values/Notes - Porsche 928 Workshop Manual

928
Differential, transaxle system
39
4. Nominal values/Notes
Nominal values Notes
Pressure reservoir - Gas filling pressure
new 80 + 5 bar
wear limit
40 bar
Switching points of the pressure warning
switch
PSD off
Warning point
up to approx. 115 bar
max. up to 133 bar
sure reductrnn as of 105 + 2 I - 5 bar
Cut-out point of the pump
at the latest at approx. 160 bar
at the earliest at approx. 160 bar
Cut-in point of the pump
(after pressure reduction) 140 + 5 / - 6 bar
Freedom from leaks of the lock hydraulics
Pressure reduction, starting from the cut-out
point of the pump (precondition: the nominal
value has been achieved)
not below 140 bar in 30 minutes
not below 100 bar in 3 hours
Replace pressure reservoir if the gas filling pres,
sure has reached or fallen below the wear limit
If the actual values deviate from the nominal val-
ues, replace the pressure warning switch.
Read off the pressure immediately after the pump
cuts out automatically.
Fill the pressure reservoir completely 2x pre-
viously (start the pump running again after the 1st
cut-out operation by opening the bleeder valve on
the pressure gauge). Use a collection bottle.
Then turn the ignition key to position 0 and di-
sconnect the electrical plug at the pump.
mleak:Retighten lines or replace the corre-
sponding parts.
Possible internal leaks:
Refer to Page D39-256
a
PSD diagnosiflroubleshooting
Printed In Germany - XXXV, 1995
D39 - 255