Bomag BW 156 D-3 Service Manual page 154

Service Training
If the diesel motor is running and the generator is intact
• the coil of relay (K36:34) is excited,
• the contact closes.
Current can now flow
• from potential K11,
• via the contacts of relay (K48:07)
• the contacts of relay (K36:33)
• and, with the EMERGENCY STOP switch (S01:34), to solenoid valve (Y04:34).
The brake is released.
If the MD+ signal is missing, e.g. because of a snapped V-belt, a defective generator or if the engine
has been stalled, e.g. on a slope, to coil of relay (K36:34) is no longer excited. Contact (K36) will open
and interrupt the current flow to solenoid valve (Y04:34), the brake will close.
To still be able to drive the machine for a short time, e.g. after a V-belt has snapped or the generator is
defective, the contacts 30-87 of relay (K36:34) must be bridged.
BW 156/177 D-3/PD-3 - G 13 -
BW 178/179 D-3/PD-3