HYDRAULICS
4203781 First Edition 6-49
6
!
CAUTION
9. Slowly close flow meter valve (2) until pressure
reaches 2250 psi (155 bar). Read and record the left
wing cutting unit pump loaded flow.
10. Open flow meter valve (2), disengage switches, and
stop engine.
11. Calculate left cutting unit pump leakage.
(Step 13 of previous test – Step 9 / Step 13 of
previous test x 100 = Leak Percentage)
Is left wing cutting unit pump leakage 10% or
less?
YES The left wing cutting unit pump is good.
Proceed to “Left Wing Cutting Unit Deck
Valve Test” on page 6-49.
NO Proceed to next question.
Is left wing cutting unit pump leakage 11% to
20%?
YES The left wing cutting unit pump is marginal.
Additional testing is required. Proceed to
“Left Wing Cutting Unit Deck Valve Test” on
page 6-49.
NO Proceed to next question.
Is left wing cutting unit pump leakage 21% or
more?
YES Repair or replace left wing cutting unit pump.
(See “Gear Pump” on page 6-58.) Then
proceed to “Left Wing Cutting Unit Deck
Valve Test” on page 6-49.
Left Wing Cutting Unit Deck Valve
Test
See Figures 6-49 through 6-51.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Before performing this test, perform left wing cutting
unit pump test, leaving flow meter connected as
outlined.
Figure 6-49
3. Install blocking disk at fitting (1) on left wing inside
cutting unit motor, blocking oil flow from entering left
wing inside cutting unit motor.
Do not exceed 3350 psi (231 bar) when testing
pump 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
• -10 ORFS Test Hose 3000 psi (207 bar)
• -10 ORFS Tee Fitting
• -10 ORFS Blocking Disk
TN2259
1
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