Service Manual

4-31Z Master Z597 Diesel Service Manual
4
HYDRAULIC SYSTEM
6. Before starting the engine make sure the hydraulic
lines are held away from moving parts and the
mufer. The pump used in this system is designed
to run at 1.6 to 1.7 gpm (6 to 6.4 lpm) at 3000 PSI
(20684 kPa) continuous pressure. Under little or no
restriction, you should measure 3 to 4 gpm (11 to 15
lpm) at full engine speed.
7. Make sure the restrictor valve is in the full “OPEN”
position. Start the engine. Allow at least 5 minutes
for the hydraulic system to reach operating
temperature. Run the machine at full speed. The
gauge should read approximately 3 to 4 gpm (11
to 15 lpm) under no restriction. Record the ow
reading.
Fig 217 fan motor test
FAN
MOTOR
CASE DRAIN
TO COOLER
RETURN TO PUMP
RESUME LINE
FROM PUMP
FLOW TESTER
5. Remove the hydraulic pressure and return lines at
the fan hydraulic motor. Connect the ow meter as
shown (Fig. 217).
Note: If using a directional ow tester, be sure to
correctly connect hoses.
8. With the engine running at full rpm, carefully close
the restrictor valve until 1500 PSI (10342 kPa) is
reached. There should be approximately 1 gpm ow
loss under pressure.
If ow drops more than 1 gpm (3.8 lpm), replace
the pump. If the pump falls within spec, replace
the motor or inspect the cooling system for other
component failure.
Caution: DO NOT operate the machine for an
extended period of time at 1500 psi
(10342 kPa) system pressure. Hydraulic
temperatures can rise quickly under
pressure. Open the ow tester restrictor
valve, bring the engine to idle, and shut
the machine off.
9. Remove the ow tester from the machine.
Reconnect the hydraulic lines to the fan motor.
10. Re-install the rear heat shield.
11. Close the hood.
12. Reconnect the seat switch and lower the seat.
Check the pump drive belt for wear after every 50 hours
of operation.
1. Tilt the seat forward and remove the front engine
panel.
Replacing the Traction Pump Drive
Belt