HYDRAULICS
673831-Rev A 6-37
6
17. Calculate rear cutting units circuit leakage.
(Step 14 – Step 15 / Step 14 x 100 = Leak
Percentage)
Is rear cutting units circuit leakage 10% or less?
YES The rear cutting units circuit is good.
Proceed to “Rear Reel Motors Test” on
page 6-40.
NO Proceed to next question.
Is rear cutting units circuit leakage 11% to 20%?
YES The rear cutting units circuit is marginal.
Additional testing is required. Proceed to
“Rear Cutting Units Pump Test” on
page 6-37.
NO Proceed to next question.
Is rear cutting units circuit leakage 21% or more?
YES Test individual components in rear cutting
units circuit for leakage. Proceed to “Rear
Cutting Units Pump Test” on page 6-37.
Rear Cutting Units Pump Test
See Figures 6-33 through 6-35.
• Performing this test will isolate the rear cutting
units pump from the rest of the rear cutting units
circuit.
• This test works together with the “Rear Cutting
Units Circuit Test,” “Rear Reel Valve Test,” and
“Rear Reel Motors Test” to isolate a problem with
the rear cutting units circuit.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Before performing this test, perform “Rear Cutting
Units Circuit Test,” leaving flow meter connected as
outlined.
Figure 6-33
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
• -6 ORFS Test Hose 4000 psi (276 bar)
• -6 ORFS Tee Fitting
• -6 ORFS Blocking Disk
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