KAESER EPC 1000-2-500, Service Manual

Page: 77 / 110

10.19.1 Checking the cylinder head and valves
The condition of the valves can be assessed by measuring the air receiver charging time and com‐
paring this with the charging time when the machine was new.
Precondition Machine at operating temperature.
1. Close the user's shut-off valve between the machine and the air network.
2. Start the machine and measure the air receiver charging time.
Result The valves should be checked for coking if there is a significant difference between the measured
charging time and the charging time when the machine was new.
Further information See chapter 7.7 for air receiver charging time measurement.
10.19.2 Cleaning the cylinder head and valves
The machine must be isolated from the compressed air network and completely vented before un‐
dertaking any work on the pressure system.
Precondition The supply disconnecting device is switched off,
the device is locked off,
the absence of voltage has been verified.
The machine is fully vented, the pressure gauge on the air receiver reads 0 bar.
The user's shut-off valve between the machine and the air network is closed.
1. Remove the cylinder head screws and lift off the head.
2. Remove the cap nut (if one is fitted).
3. Clean the cylinder head and valves.
4. After cleaning the cylinder head and valves, mount the head with the gasket and tighten the
screws diagonally.
Tightening torque for cylinder head screws
Model Low pressure cylinder
head
screws M
A
[Nm]
High pressure cylinder
head
screws M
A
[Nm]
Cap nut M
A
[Nm]
EPC 230–2 — — —
EPC 420–2 — — —
EPC 550–2 — — —
EPC 750–2 80 46 —
EPC 1000–2 80 46 —
Tab. 35 Head fixing tightening torque
10.19.3 Starting the machine and carrying out a trial run
1. Open the user's shut-off valve between the machine and the air system.
2. Switch on the machine (power supply disconnecting device).
3. Switch off the machine and check visually for leaks.
10 Maintenance
10.19 Cylinder head and valves
No.: 9_9431_02 E
Service Manual 2-stage piston compressor
EPC
67