HYDRAULIC SYSTEM
4-33Z580/Z593/Z595 Diesel Service Manual
4
7. Verify the restrictor valve on the hydraulic fl ow tester
is in the fully “Opened” position (Fig. 344).
10. Stroke the left hand hydrostatic lever fully forward.
Very slowly, rotate the “T” handle of the adjustable
fl ow tester restrictor valve until the pressure gauge
reaches 500 PSI (3447 kPa). The measured fl ow
should be 13 to 15 gpm (49 to 56.8 lpm) (Fig. 345).
Fig 344 PICT-3497
Fig 345 PICT-3509a
11. With the unit at full engine throttle speed, slowly
rotate the “T” handle of the fl ow tester restrictor
valve clockwise until the pressure gauge reads
approximately 1000 to 1200 psi (6895 to 8274 kPa)
(Fig. 346).
Caution: DO NOT operate the machine for an ex-
tended period of time at the 1200 psi (8274 kPa)
rate.
8. Start the machine. Run it for approximately 5
minutes to warm the oil in the hydrostatic system.
9. Release the parking brake and bring both levers to
the inside neutral position. Set the engine throttle to
full RPM.
Fig 346 PICT-3509a
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