Charge Relief Valve Pressure Test - Toro Greensmaster TriFlex 3320/3420 Service Manual

Charge Relief Valve Pressure Test (Using Pressure Gauge)
TO POWER
STEERING VALVE
TO
HYDRAULIC
RESERVOIR
110 -- 150
1.44
.33
GEAR
PUMP
FROM
HYDRAULIC
TRANSPORT = 17.5 GPM AT 10 MPH
RESERVOIR
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 by operating the machine for approximately ten
(10) minutes.
2. Park machine on a level surface with the cutting units
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.
Hydraulic System
FROM
POWER STEERING AND
LIFT CONTROL VALVES
PRESSURE
GAUGE
C
3000
PSI
PSI
3000
PSI
MOW = 6.7 GPM AT 3.8 MPH
HYDROSTAT
70 to
100
PSI
1.9 GPM
G1
C1
BOTTOM
PORT
BYPASS
VALVE
3. Thoroughly clean junction of hydraulic hose and hy-
draulic tube that runs under piston (traction) pump. Dis-
connect hydraulic hose from the hydraulic tube (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. Move throttle so engine is running at high idle speed.
8. Pressure gauge should read 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.
Page 5 - - 30
A
TOP
PORT
G2
10.3
ENGINE
20.6
B B A
OPTIONAL 3WD
Greensmaster 3320/3420
10.3