MacDon M155 Installation Instructions Manual page 19

1. To measure CR pressure, attach a 1000 psi (7000 kPa)
pressure gauge to the test fitting at port CRG (A).
2. To measure CP pressure, do one of the following:
• Attach a 1000 psi (7000 kPa) pressure gauge to the
test fitting at port CPG (B); OR
• Attach a flow meter capable of reading flow as high
as 28 gpm (106 lpm) and a 1000 psi (7000 kPa)
pressure gauge between port CP and cooler. The
test equipment must attach to the #12 JIC fitting at
port CP on the cooler bypass manifold.
3. Start engine and run at high idle (wide open throttle)
until hydraulic oil temperature is between 135–145°F
(57–63°C). If using a flow meter, the reading should be
between 20–24 gpm (76–91 lpm).
4. Record CP and CR pressures. CP pressure should be
between 500–605 psi (3447–4171 kPa).
5. If CP pressure is not between 500–605 psi
(3447–4171 kPa), adjust pressure by removing cap (C)
and increasing or decreasing cooler bypass setting by
turning adjustment screw.
NOTE:
CR pressure is not adjustable.
6. When CP pressure is in the correct range, subtract the
CR pressure reading from the CP pressure reading.
The differential pressure should range between
80–200 psi (552–1380 kPa). A differential pressure
lower than 80 psi (552 kPa) indicates a possible
defective hydraulic cooler.
147595
INSTALLATION INSTRUCTIONS
Figure 3.9: Hydraulic Ports on New Cooler
Bypass Manifold
13
Revision B