MacDon 873 Combine Adapter - Manual (Page 33)

Form # 147069 Issue 09/06 31
MAINTENANCE/SERVICE
HYDRAULIC SYSTEM (continued)
To check sequence valve operation:
If adapter drum and feed draper circuit relief
pressures check out to specification as described on
previous page, but these pressures are not reached
under field operating conditions, check the operation
of the sequence valve (A) in the valve block as
follows:
1. With test fixture installed between the hose and
the lower port of the feed draper motor at (D) as
on previous page, run combine engine at
operating speed and engage feeder house drive
in forward.
2. With needle valve open, pressure reading at (D)
should be 60 psi (4.22 KPa) or less.
3. If reading is 60 psi or less, and correct operating
relief pressures cannot be reached, replace
sequence valve (A).
4. If pressure reading is above 60 psi, there may be
a flow restriction in one of the hydraulic lines or
hoses. Check for signs of crimping or collapsing
and correct.
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).
Check lubricant level with top of box close to
horizontal as shown. Level should be in middle of
sight glass.
Breather plug – (B) Level sight glass – (L) Drain plug – (P) Fill plug – (F)
NOTE: Tighten plugs to 135 in. lbs. (15.25 N.m)
Tighten Allen screws (G) securing pump to gearbox to 14 ft-lbs (20 N.m)
D
READ GAUGE HERE FOR SEQUENCE VALVE
SEQUENCE VALVE
A
GEARBOX PLUGS – CASE 2300 SERIES
& JD Level Land Prior to 50 Series
B
P
L
F
GEARBOX PLUGS – LEXION
B F
L
P
GEARBOX PLUGS – CASE AFX, NH, GL
JD Contour Master & 50 Series Level Land
B
L
P
F
G