MacDon 872 Combine Adapter - Manual (Page 23)

23
MAINTENANCE/SERVICE
HYDRAULIC SYSTEM (continued)
Flow Control Relief Pressure
A possible cause of insufficient draper speed is
low relief pressure.
To check relief pressure:
1. Attach a 5000 psi (34.5 MPa) pressure gauge
in gauge port (GP) of valve block.
2. Install a needle valve between the orange
colour coded male coupler on adapter and the
orange colour coded female coupler on header.
NOTE: Using the needle valve built into the
valve block will not check relief pressure.
3. Set flow control knob to number 6 on dial.
4. Run combine engine at operating speed.
5. Engage header drive.
6. Close needle valve until flow stops. Pressure
reading should be 3100 psi (21.4 MPa).
WARNING: To avoid bodily injury
from bursting hoses and/or
exploding components, do not
exceed 3250 psi pressure (22.4 MPa). Do not
continue closing needle valve if pressure
exceeds 3250 psi (22.4 MPa).
If relief pressure requires adjustment:
1. Loosen jam nut (C).
2. Turn relief screw until relief pressure is correct.
3. Tighten jam nut.
GEARBOX LUBRICATION
Change gearbox oil every 1000 hours or 3 years.
Box capacity: 450 mL (15 U.S. oz.)
Lubricant: SAE 85W-140 gear lube (API Service Classification GL-5).
Breather plug – (B)
Level plug – (L)
Drain plug – (D)
FLOW CONTROL RELIEF ADJUSTMENT
GP
C
B
NH, JD Contour Master CASE, GLEANER & JD CAT LEXION
& JD 50 Series Level Land Level Land prior to 50 Series
L
D
B
L
D
B
L
D