Yanmar YM276 Service Manual page 658

270-20-1 0
Hydraulic System Tests and Diagnosis
HYDRAULIC PUMP FLOW TEST
A
1. Lower the hydraulic lift and relieve any remaining hydraulic
pressure.
CAUTION:
Fluid Escaping under pressure can have suff-
A . .
lclent force t o penetrate the skin, causing serious personal
iniurf. Before disconnecting lines, be sure t o relive all
pressures. Before applying pressure t o system.
he
sure all
connections are tight and that pipes are.
Fluid escaping from avew small hole can be almost invisible.
Use a piece of cardboard or wood, rather than hands, t o
search for suspected leaks.
If
injured b y escaping fluid, see a d o n o r at once. Serious
infection or reaction can develop i f proper medical treatment
isnot administered immediately.
2.
Make sure that the stop valve is completely open before
performing hydraulic pump flow test.
3.
Remove outlet plug
[ A )
from cylinder head and install a 1/4-18'
NPTF headlers plug (Bl to block direet passage t o control valve
through inlet port.
A
- Outlet Plug
B
-Plug
1/4-18
NPTF
C
-
Inlet Hae
A
D -
Flow
Meter
E
-Outlet Hose
F
-
To
reservoir
4. Remove return port plug ( F ) located on the left side of trans-
mission case and install flow meter outlet hose (El. Wire the
inlet hose IC) i n place required.
Two plug holes on cylinder head and return oil plug hole
on transmission c a e have SAE 3/4-16 UNF-2B thread
with O-ring
born.
5.
Completely open flow meter
ID)
and operate engine at 2600
rpm.
6.
Adjust flow meter control valve t o 10.34 MPa (103 kg/cm2)
11500 psi).
7. Flow should be 31.2 Plmin 18.24 US gpm).
8. If
flow i s low. see page 270-20.13
9. Remove flow meter and remove headless plug from outlet port
of cylinder head. install plugs with O-rings in outlet ports
on cylinder head and return port.
Do not leave the headless plug in the cylinder head outlet
-
port after completing the test.
SME2160f 11 4 3 0 4 YMZ76and Z76D
Kinomoro, Printed ;m Jawn