Aligning The Pto Drive Pulley - Toro 74310 Operator's Manual

CAUTION
Raising the mower deck for service or maintenance
relying solely on mechanical or hydraulic jacks
could be dangerous. The mechanical or hydraulic
jacks may not be enough support or may
malfunction allowing the unit to fall, which could
cause injury.
Do Not rely solely on mechanical or hydraulic jacks
for support. Use adequate jack stands or equivalent
support.
Set neutral position as follows:
1. Stop the machine and move the speed-control lever to
the neutral position.
2. Disengage the PTO, engage the parking brake, stop the
engine, and wait for all moving parts to stop.
3. Remove the electrical connection from the seat safety
switch, located directly in front of the seat switch
assembly.
4. The neutral adjustment must be made with the drive
wheels turning. Raise the frame and place on jack
stands so that drive wheels can rotate freely.
5. Temporarily install a jumper wire across the terminals
in the connector of the wiring harness.
6. Start the engine.
7. Run the unit at least 5 minutes with the speed control
lever at full forward speed to bring hydraulic system oil
up to operating temperature.
8. Return the speed control lever to neutral (full rear)
position.
9. To obtain the neutral position, adjust the left and right
pump control rod linkages that connect the steering
control to the pump control arms until the wheels stop,
or creep slightly in reverse (Figure 57).
10. Adjust the left pump linkage by rotating the tracking
adjustment knob.
11. Adjust the right pump linkage by using a wrench to
turn the double nuts on the assembly (Figure 57)
1. Rotate tracking knob on
left side
12. Move the steering levers to the reverse position. While
applying slight pressure to the levers, allow the steering
levers to return to neutral. The wheels must stop
turning or slightly creep in reverse.
13. Stop the engine and wait for all moving parts to stop.
14. Remove the jumper wire from wire harness connector
and plug the connector into seat switch.
15. Lower the machine from the jackstands.

Aligning the PTO Drive Pulley

The PTO drive pulley alignment is necessary for any of the
following conditions:
•
The blower has been removed or replaced.
•
The engine mounting bolts have been loosened or the
engine has been moved or replaced.
•
The jackshaft mounting bolts have been loosened or the
jackshaft has been moved or replaced.
1. Stop the machine and move the speed-control lever to
the neutral position.
2. Disengage the PTO, engage the parking brake, stop the
engine, and wait for all moving parts to stop.
3. Remove the fuel tank mounting nuts and swing out
the fuel tank.
4. Verify that the blower is installed and tightly secured.
5. Loosen the four engine mounting bolts.
6. Unhook the pump belt tension spring.
7. Loosen the four jackshaft mounting bolts.
8. Measuring from the blower pulley as a baseline, move
the engine and jackshaft until the rear surface of all
three pulleys are aligned within 0.8 to 1.6 mm (1/32
inch to 1/16 inch) (Figure 58).
45
Figure 57
2. Rotate double nuts on
right side