Procedure for Mow Circuit Relief Valve (R1) Pres-
sure Test
10. Onmachineswithserialnumberabove270000000,
system pressure should be from 2700 to 3300 PSI
(186.3
to 227.7 bar). Record test results.
1.
Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
A. If this specification is met, go to step 11.
(10)
2.
units lowered. Make sure engine is off and the parking
brake is engaged. Make sure the hydraulic tank is full.
minutes.
B. If specification is not met, open control valve on
tester, shut off engine and remove solenoid relief
valve(S1R1)onmanifold(Fig.19).Cleanorreplace
valve (see Hydraulic Manifold Service (Serial Num-
ber Above 270000000) in the Service and Repairs
section of this chapter). Retest relief valve (R1)
pressure.
Park machine on a level surface with the cutting
CAUTION
11.
er and shut off engine.
Disengage cutting units.Opencontrol valve ontest-
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
12.
nect hose to the bulkhead connection.
Disconnect tester from manifold and hose. Recon-
3.
Disconnect hose connection on the bulkhead that
leads to the left reel motor.
13.
Correctly readjust bedknife.
4.
Install tester with pressure gauge and flow meter in
series with the disconnected hose and bulkhead con-
nection. Make sure the flow control valve on the test-
er is fully open.
FRONT
MANIFOLD FROM MACHINE
WITH SERIAL NUMBER
UNDER 260999999 SHOWN
5.
knife to allow clearance between bedknife and reel (no
contact).
To prevent reel damage, temporarily adjust bed-
6.
If a backlap kit is installed, make sure backlap knob
on the hydraulic manifold is in the mow position. Make
sure reel speed knob (FC1) is set to highest speed set-
ting (fully open).
RELIEF
VALVE (R1)
CAUTION
Figure 18
Keep away from reels during test to prevent per-
sonal injury from the rotating reel blades.
S2
S3
FRONT
7.
50
Start engine and move throttle to full speed (2750 +
RPM. Engage the cutting units.
S4
8.
ing the flow control valve on the tester to fully closed.
Watch pressure gauge carefully while slowly clos-
9.
On machines with serial number under 260999999,
system pressure should be from 2160 to 2640 PSI (149
to 182.2 bar). Note: If a dethatching kit is installed, sys-
tem pressure should be from 2700 to 3300 PSI (186.3
to 227.7 bar). Record test results.
S1R1
MANIFOLD FROM MACHINE
WITH SERIAL NUMBER
OVER 270000000 SHOWN
R2
A. If this specification is met, go to step 11.
Figure 19
B. If specification is not met, shut off engine and
adjust relief valve (R1) (Fig. 18) (see Adjust Man-
ifold Relief Valves in the Adjustments section of this
Chapter). After adjustment, retest relief valve (R1)
pressure.
Greensmaster 3250--D
Page 4 -- 47
Hydraulic System (Rev. I)
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