Service Manual
17P Series
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 is 160°- 210°F (71.1° - 98.9°C).
8. On the PC, PG, PJ, PE, PK, PL, PR, PW and PY, tighten the ow meter restriction valve until the gauge reads 300
psi (21bar). Record the ow reading on the Bi-Directional Flow Meter.
9. Increase the pressure to 1100 PSI (76 bar) for all models (PC, PG, PJ, PE, PK, PL, PR, PW and PY). Record the
ow reading on the Bi-Directional Flow Meter.
10. The acceptable gpm “ow droop” or (difference) is:
PC 1.0 gpm (3.7 l/min)
PG/PL/PE 1.5 gpm (5.6 l/min)
PJ/PK 2.0 gpm (7.6 l/min)
PR 2.5 gpm (9.4 l/min)
PW/PY 2.5 gpm (9.4 l/min)
If the difference exceeds these values the pump would not be operating efciently and should be repaired or replaced.
TEST EXAMPLE: PE/PG/PL
300 psi (21 bar) reading 7 gpm (26 l/min) (1st reading)
1100 psi (76 bar) reading 3 gpm (11 l/min) (2nd reading)
(PG/PL)
300 psi (21 bar) reading 7 gpm (26 l/min) (1st reading)
1100 psi (76 bar) reading 3 gpm (11 l/min) (2nd reading)
4 gpm (15 l/min) (the difference)
Subtract the 1st reading from the 2nd.
(In this example, 4 gpm difference would
indicate further pump examination).
© 2011 HYDRO-GEAR
Printed in U.S.A.
Rev. P9
1500
100 X KPa
0
500
1000
2500
PSI
3000
2000
GPM
5
10
15
0
5
BI-DIRECTIONAL
15
10
100 X KPa
500
0
1000
PSI
3000
1500
2000
2500
100 X KPa
0
PSI
3000
GPM
15
10
5
0
5
15
10
BI-DIRECTIONAL
1500
1000
500
2000
2500
100 X KPa
0
PSI
3000
1000
500
2000
1500
2500
RESTRICTION
VALVE
CONNECTIONS TO
THE FWD./RVS. LINES
DISCONNECTED
FROM WHEEL MOTOR
BI-DIRECTIONAL
FLOWMETER
FLOWMETER
BI-DIRECTIONAL
VALVE
RESTRICTION
FROM WHEEL MOTOR
DISCONNECTED
THE FWD./RVS. LINES
CONNECTIONS TO