REV A 4-10 127180
Flow Test Kit. (Special care should be taken to prevent
contamination debris from entering pump or wheel motor
system ports).
NOTE: Using the Bi-Directional Flow Test Kit, determina-
tion of directional flow is not necessary. The flow meter may
be connected in either direction into the forward and reverse
high pressure system lines.
NOTE: The following adapter fittings will be required when
connecting the Bi-Directional Test Kit (Excel P/N 783886 or
Hydro-Gear P/N 70661):
PG/PL Series Pumps require two 771311 adapter fittings
PJ Series Pumps require two 771311 adapter fittings
CAUTION: Make sure all fittings and hoses are attached
securely. This test is being completed on the vehicle’s high
pressure system lines. Failure to perform this properly could
result in bodily injury.
Bi-Directional Flow Testing Procedures
1. Use approved jack stands to raise the drive wheels off
the floor.
2. Open the restriction valve all the way.
3. For the pump being tested, move the steering control
levers in full forward motion. (It will be necessary to
lock the steering control levers into full forward
position to prevent false readings).
4. Increase the engine rpms until the maximum engine
rpm is achieved.
CAUTION: Damage to the flow meter and/or re-
calibration may result from testing at input speeds that
exceed the above recommendations.
5. Operate without any load for approximately 30
seconds to 1 minute. This allows the system oil
temperature to rise.
NOTE: Raising the system oil temperature will make a
difference in the readings you receive. It has been
determined that to complete this test accurately, the oil
temperature must be near system operating
temperatures. Suggested temperature range 160°–210°F
(71.1°–98.9° C).
6. Tighten the flow meter restriction valve until the gauge
reads 300 psi (21 bar).
Record the flow reading on the Bi-Directional Flow Meter.
7. Increase the pressure to 1100 PSI (76 bar).
Record the flow reading on the Bi-Directional Flow Meter.
8. The acceptable gpm “flow droop” or “difference” is:
If the difference exceeds these values the pump would
not be operating efficiently and should be replaced or
repaired. See the following example.
Never work under the machine or attachment
unless it is safely supported with jack stands. To
prevent possible injury to the servicing technician
and/or bystanders, make sure the vehicle is properly
secured.
• Make certain machine is secure when it is
raised and placed on the jack stands.
• Use only certified jack stands. Use only
appropriate jack stands, with a minimum
weight rating of 2000 pounds (907 kg) to
block the unit up.
• Use in pairs only.
• Follow the instructions supplied with the
jack stands.
PG/PL (36” mowers) 1.5 gpm (5.6 l/min)
PJ (48”/52”/60” mowers) 2.0 gpm (7.6 l/min)
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