Textron Jacobsen AR-5 Technical/Repair Manual

5-24 4181383 First Edition
HYDROSTATIC POWER TRAIN
5
52. Start engine, release brake, and run at full throttle
(2850 rpm ± 50).
53. Adjust flow lock tool (3) to allow pump to produce 15
gpm (57 lpm) in the forward direction.
54. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve until a reading of 1800 psi (124 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.
55. After warming the hydraulic oil, verify flow lock tool is
adjusted to allow pump to produce 15 gpm (57 lpm)
in the forward direction.
56. Slowly close flow meter valve until pressure reaches
2700 psi (186 bar). Read and record loaded flow.
57. Stop engine, apply brake, and return flow lock tool
back to neutral position.
58. Calculate right check valve leakage.
(Step 45 – Step 56 / Step 45 x 100 = Leak
Percentage)
Is right check valve leakage 10% or less?
YES The right check valve is good. Proceed to
Step 59.
NO Proceed to next question.
Is right check valve leakage 11% to 20%?
YES The right check valve is marginal. Additional
testing is required. Continue to step 59.
NO Proceed to next question.
Is right check valve leakage 21% or more?
YES Repair or replace right check valve. (See
“4WD Valve” on page 5-32.)
59. Remove blocking disk from location (6) of 4WD valve.
60. Install wheel restraint to right rear wheel.
61. Open flow meter valve completely before starting
engine.
NOTE
Verify engine rpm is within specification (2850 rpm ± 50)
to ensure accurate hydraulic test results.
62. Start engine, release brake, and run at full throttle
(2850 rpm ± 50).
63. Adjust flow lock tool (3) to allow pump to produce 15
gpm (57 lpm) in the forward direction.
64. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve until a reading of 1800 psi (124 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.
65. After warming the hydraulic oil, verify flow lock tool is
adjusted to allow pump to produce 15 gpm (57 lpm)
in the forward direction.
66. Slowly close flow meter valve until pressure reaches
2700 psi (186 bar). Read and record loaded flow.
67. Stop engine, apply brake, and return flow lock tool
back to neutral position.
68. Calculate right rear wheel motor leakage.
(Step 56 – Step 66 / Step 56 x 100 = Leak
Percentage)
Is right rear wheel motor leakage 10% or less?
YES The right rear wheel motor is good. Proceed
to step 69.
NO Proceed to next question.
Is right rear wheel motor leakage 11% to 20%?
YES The right rear wheel motor is marginal.
Repair or replace as needed.
NO Proceed to next question.
Is right rear wheel motor leakage 21% or more?
YES Repair or replace right rear wheel motor.
(See “Rear Wheel Motor” on page 5-39.)
69. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
70. Install and connect all components as noted prior to
test.
71. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Neutral Adjust—Servo
See Figures 5-24 and 5-25.
!
WARNING
1. Remove the center floorboard and the seat.
2. Bypass seat switch.
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
• -6 ORB Test Hose 4000 psi (276 bar)
• Pressure Gauge 4000 psi (276 bar)

Textron Jacobsen AR-5 Specifications

General

Brand	Textron
Model	Jacobsen AR-5
Category	Lawn Mower
Language	English