Gear Pump (Rear Section) Flow Test - Toro 04384 Service Manual

Procedure for Gear Pump (Rear Section) Flow 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
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
3. Thoroughly clean junction of hydraulic hose and the
hydraulic fitting in the rear gear pump section (Fig. 21).
This hose leads to port P in the steering valve.
4. Disconnect the hose from the fitting in the rear gear
pump section.
5. Install tester with pressure gauge and flow meter in
series with the gear pump fitting and the disconnected
hose. Make sure flow control valve on the tester is
fully open.
6. Make sure that traction pedal and joystick control are
in neutral and the parking brake is engaged.
7. Start engine and operate at high idle speed (2710 +
50 RPM).
IMPORTANT: Do not fully restrict oil flow through
tester. In this test, the flow tester is positioned be-
fore the circuit relief valve. Gear pump damage can
occur if the oil flow is fully restricted.
8. Watch tester flow and pressure gauge carefully while
slowly closing the flow control valve on the tester until
the pressure gauge reads 800 PSI (55 bar).
Greensmaster 3250--D
9. Flow gauge reading for a rear gear pump section in
good condition should be approximately 3.6 GPM (13.6
LPM). Record test results.
10.Open control valve on tester and shut off engine.
11. If flow was less than 3.1 GPM (11.7 LPM) or a pres-
sure of 800 PSI (55 bar) cannot be obtained, check for
restriction in the pump intake line. If line is not restricted,
remove gear pump and repair or replace as necessary.
NOTE: Implement Relief Valve Pressure and Lower
Cutting Units Relief Valve (R2) Pressure can be mea-
sured with tester positioned as described in this check
(see Implement Relief Valve Pressure Test and Lower
Cutting Units Relief Valve (R2) Pressure Test in this sec-
tion).
12.After testing is complete, disconnect tester from the
gear pump fitting and hose. Reconnect hose to the gear
pump fitting.
1
2
1. Gear pump
Page 4 - - 37
Figure 21
2. Rear section fitting
Hydraulic System