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ProCore 648 Hydraulic SystemPage 4 – 27
Procedure for Gear Pump (P2) Flow
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. Remove hydraulic tube that connects the gear pump
(P2) outlet to port P of hydraulic manifold (Fig. 23).
IMPORTANT: Make sure oil flow indicator arrow on
the flow meter is showing that oil will flow from the
gear pump, through the tester and into hydraulic
manifold port P.
5. Install elbows to fittings on pump and manifold to al-
low connection of hydraulic tester with flow meter and
pressure gauges to fittings. Install hydraulic tester in
place of the removed hydraulic tube between the gear
pump (P2) outlet and port P in the hydraulic manifold.
Make sure flow control valve on the tester is fully
open.
6. Make sure that traction lever is in neutral and the
parking brake is engaged.
7. Start and operate engine at full speed (3400 +
50
RPM).
8. Watch flow and pressure gauges carefully while
slowly closing the flow control valve until pressure
gauge reads 500 PSI.
9. Flow gauge reading should be approximately 4
GPM.
10.Open flow control valve on tester and turn off engine.
Record results of hydraulic pressure test.
11. If specification is not met, repair or replace gear
pump.
12.Disconnect tester from the pump and control man-
ifold. Reconnect hydraulic tube to the pump and man-
ifold.
1. Gear pump outlet 2. Manifold port P
Figure 23
1
2
Hydraulic
System