Hydraulic Testing; Combined Hydraulic Power Pack Gear Pump Flow And System Relief Pressure Tests - Toro ProPass 200 Service Manual

Hydraulic Testing

The most effective method for isolating problems in the
hydraulic system is by using hydraulic test equipment
such as pressure gauges and flow meters in the circuits
during various operational checks. Information regard-
ing special tools for hydraulic testing is in the Special
Tools section of Chapter 3 -- Hydraulic System.

Combined Hydraulic Power Pack Gear Pump Flow and System Relief Pressure Tests

(Using Tester with Flowmeter and Pressure Gauge)
The power pack gear pump flow test should be per-
formed to make sure that the ProPass hydraulic circuits
have adequate hydraulic flow and the system relief
pressure test identifies if the relief valve adjustment is
correct. These hydraulic tests can be done with the
same tester connections as described below.
Procedure for the Combined Power Pack Gear
Pump Flow and System Relief Pressure Tests:
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 hydraulic supply hose
and relief valve manifold fitting on right side of manifold
(Fig. 3). Disconnect supply hose from manifold fitting.
4. Install hydraulic tester (pressure and flow) in series
with the disconnected hose and the manifold fitting.
Make sure that tester flow arrow points from the mani-
fold fitting and toward the disconnected hose. 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.
Hydraulic Power Pack
IMPORTANT: To prevent possible personal injury or
machine damage when conducting hydraulic tests,
review the Precautions for Hydraulic Testing in the
Testing section of Chapter 3 - - Hydraulic System.
1. Relief valve manifold
2. Fitting
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).
8. Watch tester flow and pressure gauges 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).
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1
2
FRONT
Figure 3
3. Hydraulic supply hose
ProPass 200
3