Textron Jacobsen HR-5111 User Manual

HYDRAULICS
4203780 First Edition 6-47
6
Figure 6-45: Left Wing Cutting Unit Circuit Test—
Inside Cutting Unit Motor Blocked
9. Bypass seat switch and set park brake.
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 wing mower deck switch and engage PTO
switch.
13. Read and record the left wing cutting unit circuit no
load flow.
14. Slowly close flow meter valve (4) until pressure
reaches 2250 psi (155 bar). Read and record the left
wing cutting unit circuit loaded flow.
15. Open flow meter valve (4), disengage switches, and
stop engine.
16. Calculate left wing cutting unit circuit leakage.
(Step 13 – Step 14 / Step 13 x 100 = Leak
Percentage)
Is left wing cutting unit circuit leakage 10% or
less?
YES The left wing cutting unit circuit is good.
Proceed to “Left Wing Cutting Unit Motors
Test” on page 6-52.
NO Proceed to next question.
Is left wing cutting unit circuit leakage 11% to
20%?
YES The left wing cutting unit circuit is marginal.
Additional testing is required. Proceed to
“Left Wing Cutting Unit Pump Test” on
page 6-47.
NO Proceed to next question.
Is left wing cutting unit circuit leakage 21% or
more?
YES Test individual components in left wing
cutting unit circuit for leakage. Proceed to
“Left Wing Cutting Unit Pump Test” on
page 6-47.
Left Wing Cutting Unit Pump Test
See Figures 6-46 through 6-48.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Before performing this test, perform left wing cutting
unit circuit test, leaving flow meter connected as
outlined.
TN2077
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 (207 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