Which Hydraulic Tests Are Necessary - Toro Groundsmaster 5900 Series Service Manual

Precautions for Hydraulic Testing (continued)

Which Hydraulic Tests Are Necessary?

Groundsmaster ® 5900 & 5910
16227SL Rev B
Before disconnecting or performing any work on the hydraulic
system, all pressure in the system must be relieved and all rotating
machine parts must be stopped. Stop engine; lower or support
attachments.
1. Clean machine thoroughly before disconnecting or disassembling any
hydraulic components. Always keep in mind the need for cleanliness when
working on hydraulic equipment. Contamination will cause excessive wear of
hydraulic components.
2. Put metal caps or plugs on all hydraulic lines left open or exposed during
testing or removal of components.
3. The engine must be in good operating condition. Use a phototac when
performing a hydraulic test. Engine speed can affect the accuracy of the
tester readings.
4. The inlet and the outlet hoses for tester with pressure and flow capabilities
must be properly connected and not reversed to prevent damage to the
hydraulic tester or components.
5. When using hydraulic tester with pressure and flow capabilities, open tester
load valve completely before starting the engine to minimize the possibility of
damaging components.
6. Install hose fittings finger tight and far enough to make sure that they are not
cross−threaded before tightening them with a wrench.
7. Position tester hoses to prevent rotating machine parts from contacting and
damaging the hoses or tester.
8. Check oil level in the hydraulic reservoir. After connecting test equipment,
make sure tank is full.
9. Check control linkages for improper adjustment, binding or broken parts.
10. After installing test gauges, run engine at low speed and check for any
hydraulic oil leaks.
11. All hydraulic tests should be made with the hydraulic oil at normal operating
temperature (54 to 66 ºC (130 to 150 ºF)).
12. Before returning machine to use, make sure that hydraulic reservoir has
correct fluid level. Also, check for hydraulic leaks after test equipment has
been removed from hydraulic system.
Before beginning any hydraulic test, identify if the problem is related to the
traction circuit, PTO (mow) circuit, deck lift or steering circuit. Once the faulty
system has been identified, perform tests that relate to that circuit.
1. If a traction circuit problem exists, consider performing one or more of the
following tests: Traction Circuit Charge Pressure, Traction Circuit Relief
Pressure, Counterbalance Pressure and/or Piston (Traction) Pump Flow
Tests.
2. If a PTO (mow) circuit problem exists, consider performing one or more of
the following tests: Cutting Deck Circuit Pressure, Cutting Deck Circuit
Relief Pressure, Cutting Deck Motor Case Drain Leakage and/or Gear Pump
Flow Tests.
WARNING
Page 5–37 Hydraulic System: Testing