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Greensmaster 3320/3420Hydraulic System Page 5 -- 30
Charge Relief Valve Pressure Test (Using Pressure Gauge)
ENGINE
GEAR
C
3000
PSI
10.3
RIGHT
AB
AB
.33
1.44
110 -- 150
PSI
G1
G2
A
B
BA
TOP
PORT
BOTTOM
PORT
BACK
PORT
C1
HYDROSTAT
BYPASS
VALVE
1.9GPM
70to
MOW=6.7 GPMAT3.8 MPH
TRANSPORT=17.5GPMAT10 MPH
PSI
OPTIONAL3WD
FRONT
PORT
10.3
20.6
3000
PSI
PUMP
100
MOTOR
LEFT
MOTOR
HYDRAULIC
RESERVOIR
FROM
POWERSTEERINGAND
LIFTCONTROLVALVES
FROM
STEERINGVALVE
TO POWER
HYDRAULIC
RESERVOIR
TO
PRESSURE
GAUGE
The traction charge circuit is designed to replace loss of
hydraulic fluid from the closed loop traction circuit. The
charge relief valve pressure test will identify if charge
pressure is correct.
Procedure for Charge Relief Valve Pressure
Test:
1. Make sure hydraulic oil is at normal operating tem-
perature byoperating themachine for approximatelyten
(10) minutes.
2. Parkmachineon alevelsurface withthe cuttingunits
lowered. Make sure engine is off and the parking brake
is engaged. Make sure the hydraulic tank is full.
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
3. Thoroughly clean junction of hydraulic hose and hy-
draulic tube that runs under piston (traction) pump. Dis-
connecthydraulichosefrom thehydraulictube (Fig.21).
4. Install a tee fitting between the disconnected hose
and tube. Install a 1000 PSI (70 bar) pressure gauge to
the tee fitting.
5. Make sure that traction pedal, steering wheel and
joystick are in the neutral position.
6. Start engine and run at low idle speed. Check for hy-
draulic leakage at pressure gauge and correct before
proceeding with test.
7. Movethrottle so engine is running at high idle speed.
8. Pressure gauge should r ead approximately 110 to
150 PSI (7.6 to 10.3 bar).
9. Move throttle to low idle speed and shut off engine.
Record test results.