Procedure for Charge Relief Valve Pressure Test:
Make sure hydraulic oil is at normal operating tem-
9. A dynamic charge pressure test can be performed as
follows:
1.
perature by operating the machine for approximately 10
minutes.
A. With T−connector and pressure gauge still con-
nected, sit in the operator seat and press the traction
pedal to forward.
2.
Park machine on a level surface with the cutting units
lowered and off. Make sure engine is off and the parking
brake is engaged.
B. While machine is moving, monitor the charge
pressure reading on the pressure guage.
3.
Read Precautions for Hydraulic Testing.
C. The charge pressure should drop no more than
15%
from initial test reading (Step 7 above). A pres-
sure drop of more than 15% indicates a traction cir-
cuit leak (e.g. a worn or damaged piston pump
and/or wheel motor).
WARNING
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved. See Relieving Hy-
draulic System Pressure in the General Infor-
mation section.
10.Shut
off engine.
11.
Disconnect gauge and T−connection from the 90o
hydraulic fitting and hose connection. Reconnect hose
to the hydrostat.
4.
Disconnect hose to the rear 90o hydraulic fitting on
the piston pump coming from the hydraulic manifold port
(CHG). Connect T−connector and gauge to the fitting
and hose connection.
1
2
5.
Operate engine at full speed (2650 + 50 RPM).
6.
Make sure that traction pedal is in neutral and the
parking brake is engaged.
7.
Pressure gauge should read from 100 to 150 PSI.
8.
If charge relief pressure specification is not met, con-
sider the following:
Figure 19
A. The piston pump charge relief valve is faulty. Re-
pair or replace the piston pump charge relief valve
(see Piston Pump Service in the Service and Repairs
section).
1.
Rear 90o hydraulic fitting
2. Piston pump
B. Gear pump (P2) is faulty (steering and lift circuits
are also affected).
Reelmaster 3100−D
Hydraulic System (Rev. C)
Page 4 − 35
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