Procedure for Traction Circuit Relief Pressure Test:
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure that traction lever is adjusted to the
neutral position (see Operator’s Manual).
10.One person should operate the machine while
another person reads the gauge.
1.
11.Make sure that parking brake is engaged. Start and
run engine at full speed (3400 + 50 RPM).
CAUTION
2.
fully raised. Make sure engine is off and parking brake
is engaged. Secure coring head with service latch.
Park machine on a level surface with the coring head
Use extreme caution when conducting test. The
front wheel of the machine will be trying to move
the machine.
3.
tion.
Read Precautions For Hydraulic Testing in this sec-
4.
tion.
Set the aerator spacing lever to the transport posi-
12.Slowly
valve to be tested (forward or reverse).
move traction lever fully in direction of relief
5.
properly (see Operator’s Manual).
Make sure that hydraulic pump drive belt is adjusted
IMPORTANT: DO NOT hold system at relief for more
than 4 seconds.
6.
floor. Support front of machine with jackstands or block-
ing.
Lift or jack front of machine so front wheel is off the
13.Watch
when the traction circuit relief valve opens.
the pressure gauge and record pressure
TESTER READING: pressure approximately 2900
PSI in both forward and reverse direction.
CAUTION
14.Release
traction lever and turn off engine. Record re-
sults of hydraulic pressure test.
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil.
15.If traction pressure is too low, inspect relief valves in
piston (traction) pump (see the HYDRO–GEAR
BDP–10A/16A/21L HYDROSTATIC PUMPS SERVICE
AND REPAIR MANUAL at the end of this chapter).
Clean or replace relief valves as necessary as they are
not adjustable. If relief valves are in good condition, pis-
ton (traction) pump should be suspected of wear and in-
efficiency.
7.
Clean hose fitting and disconnect appropriate hy-
draulic hose from fitting on the rear side of the traction
pump (Fig. 21):
A. For forward direction relief pressure test, discon-
nect hose from lower 45o fitting. NOTE: forward relief
pressure can also be measured with hydraulic tester
installed as described in TEST NO. 3: Traction (Pis-
ton) Pump Flow. Make sure flow control valve on the
tester is fully open.
NOTE: Forward and reverse relief valves are identical.
Relief valves can be switched in piston (traction) pump
to help in identifying a faulty relief valve.
16.Disconnect
Tee–fitting with pressure gauge from
pump fitting and hydraulic hose. Reconnect hose to
pump fitting.
NOTE: An alternate testing location for forward di-
rection relief would be at the hydraulic hose connec-
tion to the front wheel motor P1 port.
2
B. For reverse direction relief pressure test, discon-
nect hose from upper 90o fitting.
NOTE: An alternate testing location for reverse di-
rection relief would be at the diagnostic port on the
hydraulic tube between the rear wheel motors.
8.
traction pump and the disconnected hose.
Install Tee–fitting with pressure gauge between the
1
9.
Check and adjust the oil level in the reservoir after
connecting pressure gauge.
Figure 21
1.
Lower 45o fitting
2.
Upper 90o fitting
ProCore 648
Page 4 – 25
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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