MAINTENANCE AND S ERVICING
Header and Reel Hydraulics
Pressure Compensator Valve
The pressure c
ompensator valve protects the header drive pumps from overheating under very heavy loads.
When the oper
ating pressure reaches the ab solute pressure limit setting ( refer to 5.3 Header Hydraulic Pressures,
page 407)thecom
pensator valve in the pump is activated and the header drive will slow down to avoid overheating
the drive pum
ps. At this point, reduce the ground speed to maintain the correct system load and header
drive operat
ion.
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 warnin
g 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
Applicat
ion/System
Windrower Absolute
Pressure Limit Setting
psi (kPa)
Suggeste
dOverload
Warning S
etting
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
press
ure
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 B locks
Two hydraulic valve blocks with m ultiple 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 fitt ings or
loose electrica l connections. If service is required, cont act
your MacDon Dealer.
Figure 5.195: Hydraulic Valve Blocks
147649 407 Revision A
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