Exmark 4500-355 manual Adjust Hydro Control Linkages

Page 34

Maintenance

to see if the wheel stops. If not, repeat the

Note: If inconsistent neutral occurs,

above adjustment procedure.

check to be sure both springs are properly

6. Make this adjustment on both sides.

tightened on the speed control lever under the

7. After adjustments are made and the wheels

console–especially the rear pivot spring.

Repeat above adjustments if necessary.

stop when the drive levers are in the neutral

position, tighten the nuts against the yokes.

3. Place the speed control lever in neutral. Adjust

• Adjust Hydro Control Linkages:

the right side linkage by turning the quick track

1. Place the speed control lever in the “neutral”

knob counterclockwise until the tire begins to

rotate forward. Begin to retighten the knob

position. This adjustment is again made with

clockwise about 1/4 turn at a time, stopping

rear of machine on jack stands and engine

to move the speed control forward and back

running at full throttle. OPC levers will have

to neutral. Recheck the drive wheel rotation

to be held down and the park brake must be

to see if further adjustment is necessary.

disengaged whenever speed control levers are

4. The spring that keeps tension on the knob

moved out of the neutral position.

Note: The neutral lock latches should be

should normally not need adjustment.

However, if adjustment is needed, adjust to

“unlocked” and in the forward position.

where length of spring is about 1 inch (2.5 cm)

2. Loosen the front nut on left hydro control

between the washers. Adjust spring length by

linkage as shown in Figure 20. Turn the rear

turning nut at front of spring.

control linkage adjusting nut counterclockwise

• Drive Lever Linkage Adjustment:

until wheel rotates forward. Turn the rear nut

1. With rear of machine still on jack stands and

of left control linkage clockwise 1/4 of a turn

engine running at full throttle, disengage

at a time, stopping to move the speed control

the park brake and move the speed control

forward and back to neutral, until left wheel

lever to the midway position. Move the

stops rotating forward.

respective drive lever upward until it reaches

Turn the rear nut an additional 1/2 turn and

the neutral position and engage neutral lock

tighten the front nut making sure not to put

latches (Figure 22). If the tire rotates in either

a bind on the linkage. Make sure flat part of

direction, the length of the drive lever link will

linkage is perpendicular to pin part of swivel

need to be adjusted.

(see Figure 21).

 

 

 

 

 

 

 

 

 

 

Figure 21

1.

Left Hydro Control Link

4.

Linkage is perpendicular

 

(left side shown)

 

to pin (correct position)

2.

Front nut

5.

Linkage in incorrect

3.

Rear nut

 

position

6.

End view of swivel

After adjusting the left hydro control linkage, move the speed control lever to the mid-speed position and then back to the neutral position. Recheck the left drive wheel rotation to see if further adjustment is necessary - be sure the speed control lever is in the neutral position.

Figure 22

2.Adjust the linkage length by loosening the jam nuts at both ends of the linkage and rotating the linkage in the ball joints. Lengthen the linkage if the tire is turning in reverse and

34

Image 34
Contents Viking Hydro California Introduction Contents Safe Operating Practices SafetySafety Alert Symbol TrainingSafety Operation Slope OperationMaintenance and Storage Safety Safety and Instructional Decals 103-1798 103-2076 103-2103 103-2196 103-2242 116-0404 103-2243 103-4935 103-5626 Model Numbers SpecificationsSystems Dimensions Torque RequirementsOperator Presence Control OPC Product Overview OperationControls LeversNeutral Lock Latch Off-Run SwitchTracking Adjustment Knob Park Brake LeverPre-Start Operating InstructionsStopping the Engine Disengaging the PTODriving the Machine Transporting Transporting a UnitMaintenance Recommended Maintenance SchedulesCheck Mower Blades Check Engine Oil LevelReplacing the Discharge Deflector Check Safety Interlock System Check for Loose HardwareCheck Hydraulic Oil Level Service Pre-Cleaner Element and Air CleanerChange Engine Oil Check Tire PressuresChange Fuel Filter Lubricate Grease FittingsCheck Spark Plugs Change Hydraulic System FilterHydraulic System Air Purge LevelMobil HTS Grease Or Food-Grade Anti-seize Wheel Hub-Slotted Nut Torque SpecificationThread Locking Adhesives Copper-Based Anti-seizeAdjustments Adjusting the Cutting HeightAdjusting the Axle Position Adjusting the Number of Spacers below Caster Support Hub Adjusting the Cutting Height with Blade SpacersPTO Engagement Linkage Adjustment PTO Safety Switch AdjustmentEngine to Mower Deck Belt Adjustment Inch Deck Shown for Reference OnlyBelt Guide Adjustment Blade Brake AdjustmentPump Drive Belt Tension Adjustment Hydro Drive Linkage Adjustment Adjust Hydro Control Linkages Hydro Pump Spring Tension Setting Park Brake AdjustmentClean Grass Build-Up Under Deck Clean Engine Air Cooling SystemRemove Engine Shrouds and Clean Cooling Fins Waste DisposalTroubleshooting Problem Possible Cause Corrective ActionTroubleshooting Schematics Wiring DiagramSchematics Exmark Commercial Turf Equipment Page Page See EXMARK’S Complete Line of Accessories and Options