Jacobsen AR3, Technical/Repair Manual

Page: 225 / 342

6-34 4181384 First Edition
HYDRAULICS
6
!
CAUTION
12. Continue to close flow meter valve (2) until zero flow
is obtained. Record mow/brake relief valve pressure.
13. Open flow meter valve (2) and stop engine.
NOTE
Pressure relief valve settings vary amongst models.
Determine which model is being tested and choose the
correct question below.
TR-3 and Early Model AR-3 30001. Is mow/brake
relief valve pressure 3046 psi (210 bar)?
YES Mow/brake pressure relief valve is good.
Proceed to step 14.
NO Adjust mow/brake valve relief pressure. (See
“Adjust Mow/Brake Valve Relief Pressure” on
page 6-34.)
Late Model AR-3 30002. Is mow/brake relief valve
pressure 3626 psi (250 bar)?
YES Mow/brake pressure relief valve is good.
Proceed to step 14.
NO Adjust mow/brake valve relief pressure. (See
“Adjust Mow/Brake Valve Relief Pressure” on
page 6-34.)
14. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
15. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Adjust Mow/Brake Valve Relief
Pressure
See Figure 6-27.
!
WARNING
IMPORTANT
This adjustment should be done in conjunction with
mow/brake valve tests.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-7.)
2. Perform mow/brake valve test. (See “Mow/Brake
Valve Tests” on page 6-33.)
3. Raise seat platform.
Figure 6-27
4. Loosen lock nut (2).
5. Rotate screw (1) to adjust the relief valve pressure
setting.
Do not exceed 3650 psi (252 bar) when testing
system relief valve or equipment damage may
occur.
The hydraulic system is under pressure, and the
oil will be hot.
• Always relieve pressure in the hydraulic
system before performing service.
• Failure to follow appropriate safety
precautions may result in death or serious
injury.
Required Tools and Materials
• Flow Meter
• Test Hose 4000 psi (276 bar)
• Tee Fitting
• Blocking Disk
2
1
TN1279