Textron Jacobsen HR-5111 User Manual

HYDRAULICS
4203780 First Edition 6-29
6
Figure 6-18: Front Cutting Unit Circuit Test—Left
Front Cutting Unit Motor Blocked
8. Set park brake.
9. Bypass seat switch.
NOTE
Verify engine rpm is within specification (2800 rpm ± 50)
to ensure accurate hydraulic test results.
10. Start engine and run at full throttle (2800 rpm ± 50).
11. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (4) until a reading of 1500 psi (103
bar) or one half of the relief valve rating is reached.
Warm oil to 120—150° F (49—65° C); open valve
fully after operating temperature is reached.
12. Enable front mower deck switch and engage PTO
switch.
13. Read and record the front cutting unit circuit no load
flow.
14. Slowly close flow meter valve (4) until pressure
reaches 2250 psi (155 bar). Read and record the
front cutting unit circuit loaded flow.
15. Open flow meter valve (4), disengage switches, and
stop engine.
16. Calculate front cutting units circuit leakage.
(Step 13 – Step 14 / Step 13 x 100 = Leak
Percentage)
Is front cutting units circuit leakage 10% or less?
YES The front cutting units circuit is good.
Proceed to “Front Cutting Unit Motors Test”
on page 6-34.
NO Proceed to next question.
Is front cutting units circuit leakage 11% to 20%?
YES The front cutting units circuit is marginal.
Additional testing is required. Proceed to
“Front Cutting Unit Pump Test” on page 6-29.
NO Proceed to next question.
Is front cutting units circuit leakage 21% or
more?
YES Test individual components in front cutting
unit circuit for leakage. Proceed to “Front
Cutting Unit Pump Test” on page 6-29.
Front Cutting Unit Pump Test
See Figures 6-19 through 6-21.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Before performing this test, perform front cutting unit
circuit test, leaving flow meter connected as outlined.
TN2071
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
• -10 ORFS Test Hose 3600 psi (248 bar)
• -10 ORFS Tee Fitting
• -10 ORFS Blocking Disk

Textron Jacobsen HR-5111 Specifications

General

Brand	Textron
Model	Jacobsen HR-5111
Category	Lawn Mower
Language	English