Header and reel hydraulics, Pressure compensator valve – MacDon M155 Operators Manual User Manual
Page 381
NOTE:
Image showing filter head removed to show
component clarity.
1. Clean the gasket groove (B) in the filter head (A).
2. Apply a thin film of clean oil to the filter gasket (C).
3. Install new gasket into the groove (B) in the filter
head (A).
4. Screw the new filter (D) onto the filter head until the
gasket contacts the filter.
Figure 5.201: Hydraulic System
5. Tighten filter an additional 3/4 turn by hand.
IMPORTANT:
Do NOT use a filter wrench to install oil filter.
Overtightening can damage gasket and filter.
6. Check hydraulic fluid levels. Refer to
Filling Hydraulic Oil, page 360
. For capacity level, refer
to
Lubricants, Fluids, and System Capacities, page
.
Figure 5.202: Hydraulic System
Header and Reel Hydraulics
Pressure Compensator Valve
The pressure compensator valve protects the header drive pumps from overheating under very heavy loads.
When the operating pressure reaches the absolute pressure limit setting (refer to
5.19 Header Hydraulic Pressures,
) the compensator valve in the pump is activated and the header drive will slow down to avoid overheating
the drive pumps. At this point, reduce the ground speed to maintain the correct system load and header drive
operation.
NOTE:
An optional pressure sensor is available to monitor the knife or reel drive hydraulic pressure and
provide a warning tone from the cab display module (CDM) if the system pressure approaches a
preset limit. The system pressure limit is set during CDM programming. Refer to
.
.
NOTE:
The warning tone is only heard if the pressure sensor is installed and enabled.
NOTE: A warning tone is normal when the operating pressure is close to the compensator valve’s pressure
setting.
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Revision A