MacDon PW7 Pick-Up Header - Manual (Page 62)

SECTION 7 – SERVICE
Form 169149 Revision E 56
AGCO
Hydraulic/Electrical Connection
E) Hydraulic Hold Down Troubleshooting
To correct uneven cylinder operation, follow the
instructions in this section step by step to
troubleshoot its operation.
Prior to troubleshooting the hydraulics,
additional orifice should be obtained from your
local dealer. The procedures below indicate
adjustments to perform as needed.
Problem 1:
Slave Cylinder Remains
Extended More Than 1/2 inches
(13mm) When the Hold down is
Fully Lowered.
Probable Solution:
 Bleed Hydraulics
a) Bleed the hydraulics as described in the bleed
procedure.
b) Retry the hold down.
c) Check for improvement.
d) Repeat two or three times as necessary.
Problem 2:
Master Cylinder Lags Behind
Slave Cylinder on Descent and
Jumps Ahead of Slave When
Lifting.
Probable Solution(s):
 Remove Mechanical Obstruction
 Bleed Hydraulics
 Install Larger Orifice in Bottom of
Master Cylinder.
Service Parts:
 1/16 inch Orifice (Part # 01-10922-01)
 1/32 inch Orifice (Part # 01-10922-02)
a) Check for a reason for mechanical
binding.
b) Bleed the hydraulics as described in the
Bleeding of Hydraulics.
c) Retry the hold down.
d) Check for improvement.
e) Repeat two times if required.
If this does not work, then replacing the
orifice in the master cylinder may fix the
problem.
a) Loosen and remove the hose at the
bottom of the master cylinder. Keep rags
handy to clean up leaking hydraulic oil.
b) Loosen and remove the elbow from the
bottom of the master cylinder.
c) Using a large bladed flat screwdriver,
loosen and remove the orifice from inside
the bottom port of the cylinder.
d) Install the 1/16-inch orifice in the bottom
port. Do not over tighten.
e) Replace the elbow and the hose.
f) Bleed the hydraulics as described in the
Bleeding the Hydraulics.
g) Repeat two or three times as needed.
h) Check the overall operation of the hold
down.
Supply
Return
Hold-down