Service manual

Groundsmaster 3280--D/3320 Hydraulic SystemPage 5 -- 25
Procedure for Steering C ylinder Internal Leakage
Test:
The steering cylinder internal leakage test should be
performed if a s teering problem is identified. This test
will determine if the steering cylinder is faulty.
NOTE: Steering circuit operation will be affected by
rear tire pressure, steering cylinder binding, extra
weight on the vehicle and/or binding of rear axle steering
components. Make sure that these items are checked
before proceeding with steering cylinder internal leak-
age test.
1. Make sure hydraulic oil is at normal operating tem-
perature.
2. Park machine on a level surface with the cutting deck
(or implement) lowered and P.T.O. switch off. Make sure
engine is off. Set the parking brake.
3. Read Precautions For Hydraulic Testing.
CAUTION
Before opening hydraulic system, operate all
hydraulic controls to relieve system pressure
and avoid injury from pressurized hydraulic oil.
4. Turn the steering wheel for a right turn (clockwise) so
the steering cylinder rod is fully extended.
5. Remove hydraulic hose from the fitting on the rod
end of the steering cylinder. Plug the end of the hose.
6. With the engine off, continue turning the steering
wheel for a right turn (clockwise) with the steering cylin-
der fully extended. Observe the open fitting on the steer-
ing cylinder as the wheel is turned. If oil comes out of the
fitting while turning the steering wheel to the right, the
steering cylinder has internal leakage and must be re-
paired or replaced.
7. Remove plug from the hydraulic hose. Reconnect
hose to the steering cylinder fitting.
8. If a steering problem exists and the steering cylinder
tested acceptably, steering control valve requires ser-
vice (see Steering C ontrol Valve and Steering Control
Valve Service in the Service and Repairs section).
Hydraulic
System