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Cutting Unit Circuit Testing – Relief Valve Test (continued)
Greensmaster 3120
17230SL Rev C
7. Start engine. Move throttle to full speed (2850 ± 50 RPM).
8. Make sure hydraulic fluid is at normal operating temperature by operating the
machine for approximately 10 minutes.
9. Verify and record engine speed with a phototach.
Use extreme caution when performing this test. The cutting unit
reels will be rotating during the test.
10. Engage the cutting units and record the unrestricted cutting unit pressure.
11. Watch pressure gauge carefully while slowly closing the flow control valve.
A. For machines with backlap, system pressure should be approximately
17237 kPa (2500 PSI) as solenoid valve (S1R1) relief opens. Record
test results.
B. For machines without backlap, system pressure should be approximately
20684 kPa (3000 PSI) as relief valve (R1) opens. Record test results.
12. Disengage the cutting units. Open the control valve on the tester and shut
the engine OFF.
13. If specification is met, test pump (P2) flow as described in
Testing – Gear Pump (P2) Flow Test (page
clean or replace solenoid valve (S1R1) or relief valve (R1) as described in
Servicing the Mower Manifold (page 4–99)
14. Remove the tester and reconnect the hydraulic hose.
15. For machines with backlap, adjust cutting unit bedknife to reel clearance
and reel speed as necessary.
16. Check the fluid level in the hydraulic tank and adjust as necessary; refer
to traction unit Operator's Manual.
CAUTION
Page 4–55
Hydraulic System: Testing the Hydraulic System
Cutting Unit Circuit
4–56). If specification is not met,
and retest.
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