Procedure for Coring Head Raise/Lower Relief (R1)
Pressure Test:
C. If measured relief pressure is too low, check for
restriction in gear pump intake line or leakage in lift
cylinder. If pump intake line is not restricted and lift
cylinder is not leaking, increase the relief valve pres-
sure setting. Use an allen wrench and turn adjust-
ment socket clockwise. A 1/8 turn on the socket will
make a measurable change in relief pressure.
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
2.
Park machine on a level surface with the coring head
fully raised. Make sure engine is off and the parking
brake is engaged.
D. Reinstall cap on relief valve after adjustment.
E. Repeat steps 9 through 11 above until the relief
valve pressure setting is correct.
3.
Read Precautions For Hydraulic Testing in this sec-
tion.
F. If the relief valve pressure setting cannot be ad-
justed to specification, the relief valve (R1), gear
pump or lift cylinder should be suspected of wear or
damage.
CAUTION
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil.
13.When testing is complete, disconnect pressure
gauge from the hydraulic manifold G1 fitting. Reconnect
proximity switch #1. Install rear hood.
4.
manifold G1 port quick fitting (Fig. 14).
Connect pressure gauge to the hydraulic control
1
5.
6.
Remove rear hood (see Operator’s Manual).
Locate and disconnect proximity switch #1. This
switch is secured to the switch mounting bracket located
on right rear frame plate.
2
7.
and the parking brake is engaged.
Make sure that traction lever is in the neutral position
3
8.
sure will increase to relief (R1) pressure shortly after the
engine is started.
With proximity switch #1 disconnected, system pres-
Figure 16
3.
1.
2.
Hydraulic manifold
G1 port quick fitting
Relief valve (R1)
9.
Watch the pressure gauge and note pressure when the
relief valve (R1) opens.
Start and run engine at full speed (3400 + 50 RPM).
2
10.Shut
off engine. Record measured relief valve (R1)
pressure.
11.
Pressure gauge should read approximately 1000
PSI (69 Bar).
1
12.If
measured relief pressure is incorrect, adjust relief
valve (R1) as follows:
NOTE: Do not remove lift relief valve from the hydraulic
manifold for adjustment.
Figure 17
1.
Relief valve cap
2.
Adjustment socket
A. Remove the cap from the relief valve (Fig. 17).
B. If measured relief pressure is too high, decrease
relief valve pressure setting by using an allen wrench
to turn adjustment socket counterclockwise. A 1/8
turn on the socket will make a measurable change in
relief pressure.
ProCore 648
Page 4 – 21
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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