Wheel Motor Efficiency Test (Using Tester with Pressure Gauges and Flow Meter)
M5
FRONT WHEEL MOTOR TESTING SHOWN
TRACTION WHEEL
MOTORS
M4
TOP PORT
M6
LOWER
PORT
UPPER
PORT
DUMP
VALVE
3000
psi
TRACTION
RELIEF
100
to 150 psi
MANIFOLDFROM HYDRAULIC(CHG) PORT
P3
PISTON PUMP
(HYDROSTAT)
High Pressure
Low Pressure
Return or Suction
TO GEAR PUMP SUCTION
THROUGH CASE DRAIN
Flow
Figure 21
NOTE: Over a period of time, a wheel motor can wear
internally.Awornmotormayby--passoiltoitscasedrain
causing the motor to be less efficient. Eventually,
enough oil loss will cause the wheel motor to stall under
heavyloadconditions.Continuedoperationwithaworn,
inefficient motor can generate excessive heat, cause
damage to seals and other components in the hydraulic
system, and affect overall machine performance.
Hydraulic System (Rev. D)
Page 4 -- 38
Groundsmaster 3500--D
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