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 efciently 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