TYM T233 HST, Service Manual

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4. HYDRAULIC SYSTEM BLEED PROCEDURE
Reason:
To remove air trapped in the hydraulic system which will prevent proper operation.
Procedure:
IMPORTANT : If contamination is found in hydraulic system filter or inside reservoir, flush entire
hydraulic system.
NOTE : Fill the hydraulic oil filter with new oil before installing.
1.Install a new hydraulic oil filter.
2.Fill the transaxle with specified and recommended Transmission oil to the proper level in sight glass.
3.Disconnect in plug to fuel shutoff solenoid.
4.Turn the key to START and hold for 10 seconds. Turn the key to OFF.
5.Reconnect wires to fuel shutoff solenoid.
6.Raise tractor front end and support on suitable stands.
7.Start the engine and run at low idle.
IMPORTANT : If steering fails to respond, or pump pressure is not being delivered to steering control
unit (SCU), shut engine off and check to see that steering hoses are connected to the
correct SCU ports.
8.Slowly turn the steering wheel left and right until wheels turn smoothly indicating that any trapped air
has been bled back to the reservoir. has been bled back to the reservoir.
IMPORTANT : If rock shaft fails to react to lift control lever movement, shut engine off and check hose
clamps on suction tube elbow and manifold to ensure that they are properly tightened.
9.Operate rockshaft several times until it operates smoothly.
10.Stop the engine and check the hydraulic reservoir oil level. Fill as needed. Check all line connections
for leaks; tighten if necessary.
11.Lower the tractor to the ground.
12.Drive tractor in forward and reverse several times until transmission operates smoothly.
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