Service Manual

Rev. C
ProCore 648Hydraulic System Page 4 -- 28
Wheel Motor Efficiency Test (Using Tester With Flow Meter and Pressure Gauge)
Figure 24
Working Pressure
Low Pressure (Charge)
Return or Suction
Flow Direction
TCHGP
PV
R1
R2
SVR
SVQ
SVL
ORF1
CYL
G1
G2
M2 M3
M1
FORWARD
’B’ PORT
(BOTTOM)
’A’ PORT
(TOP)
’P’ PORT
FRONT
WHEEL
’P’ PORT
’P’ PORT
P2
P1
CONTROL
MANIFOLD
LIFT
CYLINDER
TEST CONNECTION FOR
REAR WHEEL MOTOR S HOWN
CAP
TESTER
CAP
NOTE: Over a period of time, a wheel motor can wear
internally. A worn motor will be less efficient and eventu-
ally, will allow the wheel motor to stall under heavy load
conditions. Continued operation w ith a worn, inefficient
motor can generate excessive heat, cause damage to
seals and other components in the hydraulic system and
affect overall machine performance.