Textron Jacobsen SLF530 - Page 224

6-30 673831-Rev A
HYDRAULICS
6
Figure 6-20
3. Install blocking disk between front reel valve hose (4)
and tee fitting (5).
4. Open flow meter valve (6) completely.
Figure 6-21: Front Cutting Units Pump Test—
Blocking Disk Between Pump and Front Reel Valve
5. Block both sides of rear wheels using suitable wheel
blocks.
6. Bypass seat switch.
NOTE
Verify engine rpm is within specification (3000 rpm ± 50)
to ensure accurate hydraulic test results.
7. Start engine and run at full throttle (3000 rpm ± 50).

CAUTION
8. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (6) until a reading of 1100 psi
(75 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.
9. Engage the mow switch, engage and release the
lift/lower joystick to the lower position twice, and
operate the reels.
10. Slowly close flow meter valve (6) until a pressure of
1650 psi (114 bar) or 75% of the relief valve rating is
reached. Read and record the front cutting units
pump loaded flow.
11. Open flow meter valve, disengage mow switch, and
stop engine.
12. Calculate front cutting units pump leakage.
(Step 14 of previous test – Step 10 / Step 14 of
previous test x 100 = Leak Percentage)
Is front cutting units pump leakage 10% or less?
YES The front cutting units pump is good.
Proceed to step 13.
NO Proceed to next question.
Is front cutting units pump leakage 11% to 20%?
YES The front cutting units pump is marginal.
Additional testing is required. Proceed to
step 13.
NO Proceed to next question.
Is front cutting units pump leakage 21% or more?
YES Repair or replace front cutting units pump.
See “Gear Pump” on page 6-49, then
proceed to step 13.
NO Proceed to step 13.
13. (See Figure 6-19.) Disconnect hydraulic hose (4) at
tee fitting (5) and remove blocking disk. Reconnect
hydraulic hose to tee fitting.
14. Proceed to “Front Reel Valve Test” on page 6-31.
MAR0161
15
GPM
2
0
25
30
1
0
5
0
0
2
0
4
0
6
0
L
P
M
8
0
1
0
0
3000
psi
BAR
0
1
00
2
0
0
30
0
4
0
0
3
6
00
420
0
48
0
0
5
4
0
0
6
0
0
0
2
4
0
0
18
0
0
1
200
6
0
0
0
250
psi
BAR
0
5
1
0
1
5
2
0
25
3
0
3
5
3
00
350
4
00
4
5
0
5
0
0
2
0
0
1
50
1
00
5
0
0
3
5
6
1
MAR0163
Do not exceed 2200 psi (251 bar) as this test does
not utilize system relief, and damage may occur
to hydraulic system components.