Toro ProCore 648 Service Manual page 57

Procedure for Charge Pressure Test:
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
2. Park machine on a level surface with the coring head
fully raised. Make sure engine is off and the parking
brake is engaged. Secure coring head with service
latch.
3. Read Precautions For Hydraulic Testing in this sec-
tion.
CAUTION
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil.
4. Connect pressure gauge to the hydraulic control
manifold G2 port quick fitting (Fig. 14).
CAUTION
If using pressure gauge with hose, make sure
that hose is free of the left, rear wheel after
installation.
5. Make sure that traction lever is in neutral and the
parking brake is engaged.
6. Start engine and operate engine at full speed (3400
+ 50 RPM).
7. Pressure gauge should read approximately 40 PSI
(2.8 Bar). Record pressure reading.
8. Turn off engine.
9. If specification is not met, inspect proportional valve
PV in control manifold.
10.A dynamic charge pressure test can be performed as
follows:
A. Leave pressure gauge connected to hydraulic
control manifold G2 port.
B. Disengage parking brake. Start engine and oper-
ate at full speed (3400 + 50 RPM). Move the traction
lever fully forward.
ProCore 648
C. While machine is moving, monitor the charge
pressure reading on the pressure gauge (do not acti-
vate the lift control while monitoring pressure).
D. The charge pressure should drop no more than
15% from initial test reading (Step 8 above). A pres-
sure drop of more than 15% indicates a traction cir-
cuit problem (e.g. damaged or leaking proportional
valve (PV), worn or damaged piston pump (P1)).
11. Shut off engine.
12.Disconnect pressure gauge from hydraulic control
manifold port G2.
1. Hydraulic manifold
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2
Figure 14
2. G2 port quick fitting
Hydraulic System
1