PSI/Doosan — OPERATION

For these PSI/Doosan models: C185, C185WKUB-T2 Export (E04).

Procedure

1.
On the Pressure Regulator, loosen the jam nut and turn screw counterclockwise until
tension is no longer felt at the screw. Then, turn screw clockwise one full turn.
2.
Close service valve(s).
3.
Inspect throttle arm (G) on engine governor to see the arm is resting against the governor
stop. Loosen jam nut on air actuating cylinder (A) and then turn cylinder rod (D) until
throttle arm (G) is forced against the governor stop.
After Starting Unit
4.
If equipped, push the SERVICE AIR button on the control panel, making certain the button
does not pop back out. The unit should speed up and then unload (and drop back to IDLE).
With the unit unloaded, turn the adjusting screw on the pressure regulator clockwise until
the discharge pressure gauge indicates 125-130 psi.Tighten the pressure regulator jam
nut.
5.
With the service valve closed, adjust IDLE speed (*). Adjust speed using adjusting rod (D).
Tighten jam nut (H).
6.
Open the service valve and adjust the discharge pressure to 100 psi (700 kPa). Now
turn adjusting rod (C) until the proper engine FULL speed setting (*) is reached.
Tighten jam nuts (B & J).
7.
To obtain maximum CFM at any pressure between 80 psi (550kPa) and maximum
pressure rating (*), make adjustment at the pressure regulator to obtain desired
discharge pressure at FULL engine speed. Lock adjusting screw and replace cover.
* See General Data Specifications.
OPERATION
Operating & Maintenance Manual
Book: 46555713 (1-28-2011) Rev B
35
Operating & Maintenance Manual
OPERATION
36
Book: 46555713 (1-28-2011) Rev B
Book: 46555713 (1-28-2011) Rev B
37
MAINTENANCE
Operating & Maintenance Manual
MAINTENANCE
38
Book: 46555713 (1-28-2011) Rev B
Maintenance
CAUTION
!
Any unauthorized modification or failure to maintain this equipment may make it
unsafe and out of factory warranty.
If performing more than visual inspections, disconnect battery cables and open
manual blowdown valve.
Use extreme care to avoid contacting hot surfaces (engine exhaust manifold and
piping, air receiver and air discharge piping, etc.).
Never operate this machine with any guards removed.
Inch and metric hardware was used in the design and assembly of this unit. Consult
the parts manual for clarification of usage.
NOTICE
Disregard any maintenance pertaining to components not provided on your
machine.
General
In addition to periodic inspections, many of the components in these units require periodic
servicing to provide maximum output and performance. Servicing may consist of pre-operation
and post-operation procedures to be performed by the operating or maintenance personnel.
The primary function of preventive maintenance is to prevent failure, and consequently, the
need for repair. Preventive maintenance is the easiest and the least expensive type of
maintenance. Maintaining your unit and keeping it clean at all times will facilitate servicing.
Scheduled Maintenance
The maintenance schedule is based on normal operation of the unit. This page can be
reproduced and used as a checklist by the service personnel. In the event unusual
environmental operating conditions exist, the schedule should be adjusted accordingly.
Compressor Oil Level
Check the compressor fluid level when the machine is not operating. Maintain the fluid level
between bottom and midway of the sight glass on the separator tank.

Source: manual:46555713 C185WKUB-T2 (E04) OPS 1-28-2011.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.