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MAINTENANCE AND SERVICING
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
5.3 Header Hydraulic Pressures,
page 407
) 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
7.1.16 Pressure Sensor Kit, page 449
.
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.
Table 5.3 Header Hydraulic Pressures
Header
Model
Application/System
Windrower Absolute
Pressure Limit Setting
psi (kPa)
Suggested Overload
Warning Setting
psi (kPa)
R-Series
Disc pressure
4200 (28,958)
4000 (27,579)
Reel/draper pressure
3200 (22,063)
3000 (20,684)
D-Series
A-Series
Knife/conditioner
pressure
4200 (28,958)
4000 (27,579)
If lift and drive capacity problems develop, the pressure compensator valve may require adjusting. Contact your
MacDon Dealer or refer to the technical service manual for your windrower.
Flow Control Blocks
Two hydraulic valve blocks with multiple cartridges are
used for the various windrower functions and are controlled
by the windrower control module (WCM) according to the
inputs from the Operator. The valve blocks are located
behind the left cab-forward side platform.
The valve blocks do not require any scheduled
maintenance other than to check for leaking
fi
ttings or
loose electrical connections. If service is required, contact
your MacDon Dealer.
Figure 5.195: Hydraulic Valve Blocks
147649
407
Revision A
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