Replacement And Wearing Parts - Bosch EFAW 65 B Instructions D'emploi

4. Maintenance
Danger of injury!
Only open the metering pump when not under
pressure (released)!
The leakproofness of the metering pump and the running time of
the pump piston should be checked at regular intervals.
4.1 Checking the running time of the pump piston
4.1.1 Checking the metering pump with the hose pipe and the
extraction probe connected
- Use a new filter paper!
- Place the metering pump under pressure and release the intake
stroke.
The running time of the pump piston for a complete intake
stroke must be between 6 and 8 seconds.
a) If the running time of the pump piston is under 6 seconds, the
metering pump should be repaired.
b) It the running time of the pump piston is over 8 seconds, check
to see whether the fault is in the metering pump, the hose pipe
or the extraction probe.
4.1.2 Checking the metering pump without the hose pipe and
the extraction probe
Place the metering pump under pressure and release the intake
stroke.
The running time of the pump piston for a complete intake stroke
must be between 6 and 8 seconds.
a) If the running time of the pump piston is now correct, the hose
pipe or the extraction probe no longer provide a completely
free passage and should be cleaned or replaced.
b) If the running time of the pump piston is over 8 seconds, the pump
cylinder and the pump piston should be cleaned and
relubricated. Only use silicon grease medium 300 (Ft2v2)!
Danger of injury!
Only open the metering pump when not under
pressure (released)!
If this does not improve matters, the metering pump should be
repaired.
4.2 Checking leakproofness
4.2.1 Checking the metering pump with the hose pipe and the
extraction probe connected
- Use new filter paper.
- Unscrew the probe head of the extraction probe and close
tightly with the seal bonnet (accessory).
- Carry out leak test:
Place the metering pump in pressure and release the intake
stroke.
The running time of the pump piston must be at least
60 seconds. If the running time of the pump piston is shorter,
check which unit (metering pump, hose pipe or extraction
probe) has a leak.
4.2.2 Checking the metering pump with the hose pipe
connected
- Undo the connection between the hose pipe and the extraction
probe.
- Close the hose pipe tight with the rubber plug (accessory).
- Repeat the leak test.
4.2.3 Checking the metering pump alone
- Undo the connection between the metering pump and the hose
pipe.
- Close the hose connection tight with the rubber plug
(accessory). To do this, press the metering pump firmly onto
the rubber plug.
- Repeat the leak test.
A metering pump that leaks should be repaired.
An extraction probe or hose pipe that leaks should be replaced.
5.

Replacement and wearing parts

Roll of filter paper (<)
ca. 16.5 m long, 40 mm wide
Bacharach grey scale
Exhaust-gas probe (<)
Hose pipe for exhaust-gas probe
Bellows (rubber ball) (<)
Reduction piece for bellows
Seal bonnet for leak test (<)
Rubber plug for leak test (<)
(<) = Wearing parts
Part number
1 687 431 003
1 681 039 001
1 680 793 161
1 680 712 105
1 680 703 033
1 683 386 079
1 680 510 019
1 680 212 005
5