Macdon 9250 SP User Manual Page 93
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Form # 46584 Issue 11/06 Web Rev_01
91
MAINTENANCE/SERVICE
Hydraulic System: Header & Reel Lift
CYLINDER CONTROL VALVE RELIEF PRESSURE
Control valve (A), located under the R/H tractor
floorboard, directs hydraulic flow to the header lift
cylinders, reel lift cylinders and the cylinder used to
engage the clutch for the sickle drive.
The control valve relief pressure is pre-set to be
sufficient for all header sizes and options. Should lift
capacity problems develop, check and adjust cylinder
control valve relief pressure as follows:
1. Lower header and reel fully, stop engine and remove
key from ignition.
2. The same relief valve protects both header and reel
lift circuits. It is most convenient to check relief
pressure in the reel lift circuit.
For tractors with reel lift hydraulics
, reel lift quick
coupler (B) is located at left-hand leg.
For tractors without reel lift hydraulics
, the header lift
circuit may be tapped at Port "C" of the lift valve.
Remove hose (C) to access port.
3. Attach a 3000 psi (20 MPa) pressure gauge to a
hose that is long enough to allow pressure to be
read from the operator's seat. Attach hose to quick
coupler or valve (see step 2) and position gauge to
be visible from the seat.
4. Start engine and position throttle lever fully back
(low idle). When oil is warm (minimum 100° F (38°
C)), activate the lift control for the circuit you have
tapped (reel or header) and check gauge pressure
reading.
5. Pressure should be as follows:
Model XX50/XX40 tractors – 2250 to 2500 psi (15.5
to 17.2 MPa)
Model XX52 tractors – 2400 to 2650psi (16.5 to 18.2
MPa)
If not, proceed with adjustment:
EXCEPTIONS: 30’ 972 Header requires 2300 psi
(15.9 MPa) minimum. 36’ 972 Header requires 2500
psi (17.2 MPa).
6. Lower header and reel fully. Stop engine and remove
key.
7. To adjust relief setting:
• Loosen jam nut at relief valve (D).
• Turn the adjustment screw in ¼ turn increments,
clockwise to increase relief pressure, counter-
clockwise to decrease.
NOTE: 1/4 turn = approx. 80 psi change
8. Repeat checking and adjustment until relief pressure
is correct, then tighten nut at (D).
IMPORTANT: If relief pressure does not increase after
adjusting the screw two or three times, check relief valve
as follows: Remove relief valve (D) from control valve
block. Check that no contaminant is preventing the
spring-loaded poppet from properly seating against the
valve
body. Clean as required, and reinstall valve. Reset
adjustment screw to original position before checking
relief pressure.
B
REEL LIFT QUICK COUPLER
C
A
CYLINDER CONTROL VALVE (FRONT VIEW)
D
CYLINDER CONTROL VALVE (REAR VIEW)
NOTE: For hydraulic schematics, see
“SCHEMATICS” section at back of this
book.
- 9250/9350/9352 1
- SELF-PROPELLED 1
- WINDROWER 1
- Proposition 65 Warning 2
- INTRODUCTION 3
- TABLE OF CONTENTS 4
- SERIAL NUMBER LOCATIONS 7
- SAFETY 10
- SPECIFICATIONS 13
- SPECIFICATIONS 14
- TORQUE SPECIFICATIONS 15
- TORQUE SPECIFICATIONS 16
- OPERATOR'S STATION 17
- Symbol Definitions 17
- OPERATOR'S STATION 19
- Mac-Monitor 19
- Mac-Monitor: 20
- Operator Presence System 21
- Speedometer 21
- Ignition Switch 22
- OPERATOR'S STATION 23
- Cab Temperature Controls 23
- Windshield Wiper Control 23
- Windrower Controls 24
- Header Controls 25
- Header Controls (continued) 26
- Seat Belts 27
- Seat Adjustments 28
- Operator Amenities 29
- OPERATION 30
- To the New Operator 30
- Break-in Period 31
- OPERATION 32
- Pre-Starting Checks: Annual 32
- Pre-Starting Checks: Daily 33
- Start-Up Procedure 34
- Driving the Windrower 36
- Stopping Procedure 40
- Leaving the Windrower 41
- Attaching the Header 42
- (continued) 44
- Adding Rear Weight 45
- Detaching the Header 47
- Header Angle 50
- HEADER TILT HYDRAULIC 50
- ADJUSTMENT 50
- Header Levelling 51
- Header Flotation 52
- Transporting the Windrower 53
- Storage Procedure 58
- Service Procedures 59
- Fuels, Fluids and Lubricants 61
- 50 Hours (continued) 64
- 200 Hours or Annually 65
- Diesel Engine 67
- Diesel Engine (continued) 69
- Diesel Engine: Fuel System 73
- Engine Exhaust System 78
- Engine Cooling System 79
- Electrical System 82
- Hydraulic System 91
- Header Drive: Hydraulics 94
- Traction Drive: Hydraulics 99
- MAINTENANCE/SERVICE 100
- Steering Checks 100
- MAINTENANCE/SERVICE 101
- Steering Checks (continued) 101
- Troubleshooting 103
- Procedure (continued) 105
- Friction Device Adjustment 106
- AT HALF-WEAR STAGE 110
- MAINTENANCE/SERVICE 111
- Traction Drive: Park Brake 111
- Cab Air System 112
- Maintenance Schedule 115
- MAINTENANCE RECORD 117
- (continued) 118
- TROUBLE SHOOTING 119
- Electrical 127
- Traction Drive System 128
- Header Hydraulics 131
- Header Drive 131
- TROUBLE SHOOTING 132
- Header Drive (continued) 133
- Park Brake 133
- Operator's Seat 133
- OPTIONS AND ATTACHMENTS 134
- UNLOADING 135
- Prepare to Unload 135
- Two Forklift Method 135
- UNLOADING 136
- One Forklift Method 136
- ASSEMBLY 137
- Install Tires 137
- ASSEMBLY 140
- Battery 140
- ASSEMBLY 141
- Adjustments and Checks 141
- Cab Heater 141
- Preparing the Tractor for 142
- Preparing 972 Harvest Header 145
- Radio Installation 146
- Two-Way Radio Installation 147
- Tool Box 147
- Swath Roller 148
- INDEX 150
- Self-Propelled Windrower 153
- Pre-Delivery Checklist 153
- Roof Wiring Schematic 155
- Cab Wiring Schematic 156
- Tractor Wiring Schematic 157
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