Hydraulic Power Pack Gear Pump Flow - Toro ProPass 200 Service Manual

Hydraulic Power Pack Gear Pump Flow (Using Tester with Flowmeter and Pressure
Gauge)
The power pack gear pump flow test listed below should
be performed after first determining that the system re-
lief valve is operating correctly (see Hydraulic Power
Pack Gear Pump Flow and System Relief Pressure
Tests in this section). The following procedure is used to
identify the gear pump flow directly from the pump out-
let.
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
2. Position machine on a level surface. If ProPass is at-
tached to tow vehicle, apply tow vehicle parking brake,
stop engine and remove key from the ignition switch.
Chock wheels to prevent ProPass machine from mov-
ing. Make sure that key switch on power pack engine is
in the OFF position. Also, 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 in the Testing sec-
tion of Chapter 3 - - Hydraulic System.
3. Thoroughly clean junction of both ends of hydraulic
tube and fittings on gear pump and relief valve manifold
(Fig. 4). Disconnect tube from both pump fitting and
manifold fitting. Then, remove hydraulic tube.
4. Install hydraulic tester (pressure and flow) in series
between the gear pump fitting and the manifold fitting.
Make sure that tester flow arrow points from the gear
pump fitting and toward the manifold. Also, make sure
flow control valve on the tester is fully open.
5. Make sure that ProPass controls for the floor and the
twin spinner are disengaged.
6. Start power pack engine and run at low idle speed.
Check for hydraulic leakage at tester connections and
correct before proceeding with test.
7. Move throttle so engine is running at high idle speed
(3750 RPM).
Hydraulic Power Pack
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).
9. Monitor the flow gauge to determine the gear pump
output (GPM/LPM). When gear pump output has been
determined, open control valve on tester, move throttle
to low idle speed and shut off engine. Record flow gauge
test results.
10.Flow gauge reading for a gear pump in good condi-
tion should be approximately 6.0 GPM (22.7 LPM).
11. If gear pump flow is less than 5.2 GPM (19.7 LPM)
or a pressure 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.
12.When testing is complete, disconnect tester from the
gear pump fitting and the manifold fitting. Reconnect hy-
draulic tube to gear pump and manifold fittings.
2
1. Gear pump
2. Relief valve manifold
Page 6 - - 10
1
3
Figure 4
3. Hydraulic tube
ProPass 200
FRONT