MacDon M155 - Traction Drive Hydraulics

MAINTENANCE AND S ERVICING
2. Open the left cab-forward side maintenance platform. Refer to 5.3.1 Opening Platforms (Standard Position),
page 309.
3. Locate valve (A) installed at port D , it controls the reel
drop rate.
NOTE:
This valve is i
nstalled on draper ready windrowers
and only affe
cts draper headers.
4. Loosen setscrew (B) then refer to the following options:
• Turn cap (C) clockwise to decrease the drop rate
• Turn cap (C) counterclockwise to increase the
drop rate
5. Check drop rate and adjust as required.
6. Tighten setscrew (B).
NOTE:
To re s et t o
factory specifications, fully close the
needle val
ve and open it four turns counterclockwise.
7. Close the platform, refer to 5.3. 2 Closing Platform s
(Standard Position), page 310.
Figure 5.197: Hydraulic System
Traction Drive Hydraulics
The windrower transmission consists of two variable displacement axial piston hydraulic pumps, one for each
drive wheel.
The pumps are driven through a gearbox from the engine. Each pump requires charge flow in order to
• Make up for internal leakage
• Maintain positive pressure in the main circuit
•Provideflow for cooling
• Replace any leakage losses from external valvin g or auxiliary systems
The charge pressure is monitored. The cab display module (CDM) sounds a tone and displays a flashing warning if
charge pres su re drops below 250 p si (1 725 kPa ). Refer to Display Warnings and Alarms, page 86.
Checking Transmission Oil Pressure
IMPORTAN T:
Rated charg
e pressure MUST be maintained under all conditions of operation to prevent damage to
the transmi
ssion.
If the TRANS OIL PRESSURE warning is displayed, shut down engine, and proceed as follows:
1. Check the hydraulic flu id level in the tank. Ref er to Checking and Filling H ydraulic Oil, page 4 01.
2. Check the hoses a nd lines for leakage.
3. Check the charge pressure relief valve. Refer to Checking Charge Pump Pressure, page 410.
4. If charge pressure still cannot be maintained, do NOT operate the windrower. Contact your MacDon Dealer.
147649 409 Revision A