Toro Greensmaster TriFlex 3320/3420 Service Manual page 97

NOTE: This steering test procedure will be affected by
incorrect rear tire pressure, binding in the hydraulic
steering cylinder, extra weight on the vehicle and/or
binding of the steering fork assembly. Make sure that
these items are checked before proceeding with any hy-
draulic testing procedure.
Procedure for Power Steering Valve Test:
1. Make sure the hydraulic tank is full.
2. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
3. Perform the Steering/Lift Relief Valve Pressure and
Steering/Lift Circuit Gear Pump Flow Tests to make sure
that relief valve and gear pump are functioning correctly
(see Steering/Lift Relief Valve Pressure and Steering/
Lift Circuit Gear Pump Flow Tests in this section).
4. Drive machine slowly in a figure eight on a flat level
surface.
A. There should be no shaking or vibration in the
steering wheel or rear wheel.
B. Steering wheel movements should be followed
immediately by a corresponding rear wheel move-
ment without the steering wheel continuing to turn.
5. Stop the unit with the engine running. Turn steering
wheel with small quick movements in both directions.
Let go of the steering wheel after each movement.
A. The steering wheel must go back immediately to
the neutral position.
B. The steering wheel should not continue to turn.
NOTE: The steering wheel must be able to turn with no
more than 45 in- -lb (5.1 N- -m) of torque.
6. If either of these performance tests indicate a steer-
ing problem, determine if the steering cylinder is faulty
using the following procedure.
A. Park machine on a level surface with the cutting
units lowered and off. Make sure engine is off and the
parking brake is engaged.
B. Turn the steering wheel all the way to the left
(counterclockwise) so the steering cylinder rod is ful-
ly extended.
C. Turn engine off.
Greensmaster 3320/3420
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
D. Read Precautions for Hydraulic Testing.
E. Remove hydraulic hose from the fitting on the ball
joint end of the steering cylinder (Fig. 26). Plug the
end of the hose.
F. With the engine off, continue turning the steering
wheel to the left (counterclockwise) with the steering
cylinder fully extended. Observe the open fitting on
the steering cylinder as the steering wheel is turned.
If oil comes out of the fitting while turning the steering
wheel to the left, the steering cylinder has internal
leakage and must be repaired or replaced.
G. When steering cylinder testing is completed, re-
move plug from the hydraulic hose. Connect hose to
the steering cylinder fitting.
7. If steering problem exists and steering cylinder
tested acceptably, power steering valve requires ser-
vice (see Power Steering Valve and Power Steering
Valve Service in the Service and Repairs section of this
chapter).
1. Steering cylinder
Page 5 - - 43
CAUTION
2
1
Figure 26
2. Ball joint end hose
Hydraulic System