Chicago Pneumatic CPS 750, Instruction Manual

Page: 77 / 94

Instruction Manual
1310 3012 02 77
CPS
6 Problem solving
It is assumed that the engine is in good condition and that there is adequate fuel flow to the filter and
injection equipment.
Make sure that the wires are not damaged and that they are clamped tight to their terminals.
For denomination of switches, relays, etc., see 2.5 Electric system .
See also section 3.3.1 Control panel .
Problem: Compressor capacity or pressure below normal.
An electrical fault must be traced by an electrician.
Possible faults Corrective actions
Air consumption exceeds capacity of
compressor. Check equipment connected.
Choked air filter elements (AF). Remove and inspect elements. Clean or
replace, if necessary.
Regulating valve (RV) defective. Dismantle and inspect parts.
Blow down valve stuck in open position. Check and correct as necessary.
Loading valve (LV) leaking past O-ring. With compressor running at max. load
speed, disconnect hose leading to
unloader. If air leaks from the hose, remove
and inspect loading valve. Replace
damaged or worn O-rings.
Oil separator element clogged. Have element removed and inspected by
an Chicago Pneumatic Service
representative.
Air intake throttle valve remains partially
closed. Remove air filters, air intake manifold and
throttle valve spring seat. Withdraw the
valve and inspect. Replace parts where
necessary. Caution: the spring seat is fixed
with 4 short and 2 long setscrews: first
remove the short screws, then release the
spring tension unscrewing the long ones.
Safety valve (SV) leaking. Remove and inspect. Replace if not airtight
after reinstallation.
Blow-off valve leaking. Remove and inspect. Replace if necessary.