GREAT PLAINS Terra Max HT1100-20 Guía
FIELD ADJUSTMENT GUIDE
Document #TLUS625C-0001B
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Document # TLUS625C-0001B
Tillage
Terra Max
Proper servicing and adjustment is key to the long life of all farm equipment. With careful and systematic
inspection of equipment, costly maintenance, time and repair can be avoided. The following information
will assist with recommended servicing and adjustments:
49664
First Time Field Setting Recommendation:
1) Gang Angle - 3-4 Degree
2) Working Depth - 2.5-3 Inches
3) Wing Down Pressure - Start in “FLOAT”. Increase to 200 PSI
if pressure is needed
4) Fore/Aft - Machine must be level front to rear to ensure all
blades are working the same depth
5) Finish Reel Down Pressure - Start in “FLOAT”. Increase to
200-300 PSI is pressure is needed
6) Operating Speed - 7-9 MPH
Models Affected:HT1100-20, HT1100-25, HT1100-30
Date: July 14, 2020
General Information
Document #TLUS625C-0001B 2 of 6
Tire Inflation Chart:
Ensure all tires are inflated to the proper operating
pressure per the table to the right. Note: Proper infla-
tion in important to ensure safe transport and level
operation of the Terra Max.
Tire Pressure
Position Size Pressure
Gauge Wheel 9.5L x 15” 8-Ply 44 PSI
Transport/
Center 20&25 Titan 380/55R x 16.5G 73 PSI
Transport/
Center 30 BKT 410/50R x 16.5 73 PSI
Transport/
Wings 25 11L-15SL 12-Ply 52 PSI
Transport/
Wings 30 12.5L x 15” 12-Ply 52 PSI
Hydraulic Hose Hookup
Color Function
Black Lift (2 Hoses)
Green Fold (2 Hoses)
Red Gang Adjustment & Leveling(2 Hoses)
Yellow Hydraulic Reel Att. (3 Hoses, one for
case drain) (Option)
Hydraulic Hose Hookup:
Great Plains hydraulic hoses have colored coded han-
dle grips to help hook up hoses to the tractor remotes.
Hoses with the same color use the same remote.
Front to Rear Leveling:
1) Completely unfold the machine will observing the
unit for any hydraulic leaks or loose fittings.
2) Once unfolded, raise the unit to re-phase the lift cir-
cuit. Hold the lift circuit open for 30 seconds to ensure
all air is purged from the hydraulic system.
3) Lower the machine so the front coulter gangs are 1-
2” off of a level surface.
4) The leveling system and gang adjustment share the
same hydraulic circuit. To change between the two dif-
ferent systems, use the switch mounted by the by-
pass valve. Note: The lights must be plugged in to
switch between gang angle and fore & aft.
5) Using the (Red) hydraulic hoses, adjust the hydrau-
lic cylinder so that the front coulter gangs are the
same distance off the ground as the rear coulter
gangs.
49657
49369
Document #TLUS625C-0001B
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49659
Wing Adjustment Turnbuckle:
Note: Prior to leveling the wings, ensure that the
machine is level front to rear.
1) Lower the machine until the coulter gangs are 1-
2” off of the ground.
2) Loosen the jam nuts, and adjust the wing turn-
buckles (shortening the turnbuckles lowers the
wings and extending the turnbuckles raises the
wings) to match the center frame.
3) Once the machine is leveled side to side, any fur-
ther adjustment in the field should be down with the
hydraulic down pressure. Note: If running gangs at
an angle and the wings are going too deep, hydrau-
lic weight transfer should be switched to float.
Wing Fold Assist Proximity Sensors Adjustment
(If Installed):
Note: Wings must be folded up and the wing safety
lock pins installed when adjusting the proximity sen-
sors to prevent damage to the sensor and bracket.
1) Loosen the nuts (one on the front and one on the
back side of the sensor bracket, adjust the proximity
sensor to 1/8” to 1/4” from the front of the proximity
sensor to the rear of the wing tube).
2) Once adjusted, re-tighten the nuts to secure the
proximity sensor in position.
Proximity sensors have built in diagnostic LED’s. If
the RED LED is illuminated, the switch is activated
(sensor sees metal). If the GREEN LED is illumi-
nated, the switch is not activated (sensor doesn’t
see metal). The switch must have 12+V for the sen-
sors to work which is powered by the light plug. 49366
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49660
Gang Angle Adjustment:
Several conditions will dictate the gang angle setting
that will accomplish the desired result:
Research has shown that 3-5 degree of gang angle is
recommended for most applications.
1) The Terra Max may be operated with gangs running
from 0-8 degrees. Changing the angle does affect the
operation of the unit. As indicated above, if the gangs
are operated at an angle, down pressure is generally
unnecessary. Operating speeds will need to be less
when operating with the gangs angled 3-6 degrees.
Operating speeds should be from 7-9 mph when oper-
ating gangs in the angled position and from 8-10 mph
when operating in the straight position.
2) When operating the gangs in the straight position (0
degrees), down pressure may be necessary, usually
between 200-400 psi.
CAUTION: When not operating with live down pressure
the fold system must be in “FLOAT” position. Failure to
operate in either float or active down pressure will dam-
age the fold system. See your tractor operator’s manual
to set system to “FLOAT “position if necessary.
48601
Hydraulic Down Pressure Adjustment: (HT1100-20,
HT1100-25, HT1100-30)
Note: This setup procedure is for tractors with closed
center pressure compensated or pressure and flow
compensating hydraulic systems. Open center hydrau-
lics are NOT SUPPORTED.
1) With the machine unfolded, engage the fold/unfold
hydraulics for continuous flow (unfold position).
2) From the tractor cab, adjust the hydraulic flow so the
needle on the bypass gauge is in the green zone 1000-
1500 psi. Note: The faster the flow of oil through the
system the greater the potential for oil heating, prema-
ture wear or tractor damage.
3) At the valve, adjust the valve to set the initial down
pressure. This is usually set at 300-400 psi (do not
exceed 800 psi).
During field operation, if the wings are running too high,
increase the pressure setting to help level the machine.
If the center of the machine is running too high,
decrease the pressure setting.
Note: When operating machine with the blades in
angled position it is generally unnecessary to apply
wing down pressure. Only in very hard ground will wing
down pressure be necessary.
CAUTION: When not operating with live down pressure
the fold system must be in “FLOAT” position. Failure to
operate in either float or active down pressure will dam-
age the fold system. See your tractor operator’s manual
to set system to “FLOAT “position if necessary.
Document #TLUS625C-0001B
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Hydraulic Single Point Depth Stop Adjustment:
The hydraulic dept stop will ensure a consistent depth
every time the implement is lowered.
1) Once the machine is level and set to the desired
working depth, set the hydraulic depth stop at the
front of the machine.
2) After setting the stop, if a change of depth is
desired, one full turn of the handle either in or out will
the change the depth approximately 1/4” up or down
respectively.
Note: Standard operating depth is 1-4”. For first time
settings a depth of 2.5-3” is recommended unless it is
too wet to go this deep.
Slight tire to ground pressure should be maintained to
prevent cylinder pin and clevis wear. If after setting
the depth stop, the detent on the tractor kick out
before the stop contacts the button on the depth stop,
slow the hydraulic flow speed down.
49661
Finishing Reel (Single or Double)
Note: Finishing reel must either be ran in “FLOAT” or
active hydraulics during field operation. Never run in
Neutral.
1) Initially it is recommended to start these out in the
“FLOAT” position so that we are not applying pressure
which could affect other components of the machine.
Once all previous settings have been completed,
increase down pressure to the reels.
2) Initial down pressure should be about 200-300 PSI.
Never exceed 800 PSI. Note: Do not run down pres-
sure in very wet fields.
49662
49661
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Gauge Wheel Adjustment:
Note: The gauge wheels should be set in the field
position to be 1/2” to 1 1/2” off the ground.
1) Loosen the set screws on each gauge wheel.
2) Turn the jack handle to adjust the spindle receiver.
Adjusting the jack handle counterclockwise will run
the wheel closer to the ground while turning the jack
handle clockwise will cause the wheel to run further
away from the ground.
3) After adjusting the gauge wheel to the desired posi-
tion, re-tighten the set screws.
49375
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