Jacobsen HR 5111, Service And Repair Instructions

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3. Using a wrench, tighten the nut the amount shown
in the chart below. The line will show which fittings
have been tightened correctly and also indicates if
a fitting is becoming loose.
37° Flare Torque Recommendations
Special Hose Installation Instructions
1. Hold the fixed portion of the hose coupling with
one wrench; use a second wrench to tighten or
loosen the hose nut. This will avoid damaging the
fitting seal. When tightening a hose, do not permit
it to twist; hold it in a normal straight position.
2. When installing mower hoses, place fittings at
angles to avoid contact with fixed parts when turn-
ing. Make sure hoses are assembled to proper “A”
and “B” ports on components.
O-RING BOSS FITTINGS
On hoses with O-ring fittings, make sure O-rings are
clean and hose fittings are properly seated before
tightening. Always install new O-rings. See Figure 8C-2.
Replacement O-rings for O-Ring Boss Fittings
NOTE
O-rings should be lubricated with the fluid to be
used in the system prior to assembly.
HYDRAULICS
SECTION 8C. GENERAL INSTRUCTIONS
8C-2
FIgure 8C-1. Reference Marking
SAE
Dash Thread Tube Torque # of Flat
Size Size O.D. In-Lbs. Rotations
3 3 ⁄
8
-24 0.188 95-105 1 1 ⁄
2
:1 3 ⁄
4
4 7 ⁄
16
-20 0.250 135-145 2 1 ⁄
4
:2 3 ⁄
4
5 1 ⁄
2
-20 0.312 170-190 3 1 ⁄
4
:3 3 ⁄
4
6 9 ⁄
16
-18 0.375 215-245 2 1 ⁄
4
:2 3 ⁄
4
8 3 ⁄
4
-16 0.500 430-470 2 1 ⁄
4
:2 3 ⁄
4
10 7 ⁄
8
-14 0.625 680-750 2:2 1 ⁄
2
12 1 1 ⁄
16
-12 0.750 950-1050 2:2 1 ⁄
2
14 1 3 ⁄
8
-12 0.875 1000-1100 1:1 1 ⁄
2
16 1 5 ⁄
16
-12 1.000 1300-1360 2 1 ⁄
4
:2 3 ⁄
4
20 1 5 ⁄
8
-12 1.250 1520-1600 1 1 ⁄
4
:1 3 ⁄
4
24 1 7 ⁄
8
-12 1.500 1900-2000 3 ⁄
4
:1 1 ⁄
4
Tube O.D. or Hose I.D. Rotate No. of Hex Flats
3/8" 2
1/2" 2
5/8" 1 1 ⁄
2
–2
1" 3 ⁄
4
–1
Figure 8C-2. Boss Fitting O-Ring Installation
A B O-Ring
Tubing O.D. Thread Jacobsen
or Hose I.D. Size Part No.
1 ⁄
8
5 ⁄
16
-24 459290
3 ⁄
16
3 ⁄
8
-24 459291
1 ⁄
4
7 ⁄
16
-20 339896
5 ⁄
16
1 ⁄
2
-20 459293
3 ⁄
8
9 ⁄
16
-18 339897
1 ⁄
2
3 ⁄
4
-16 339898
5 ⁄
8
7 ⁄
8
-14 339899
3 ⁄
4
1 1 ⁄
16
-12 339900
7 ⁄
8
1 3 ⁄
16
-12 459296
1 1 5 ⁄
16
-12 339901
1 1 ⁄
4
1 5 ⁄
8
-12 339902
1 1 ⁄
2
1 7 ⁄
8
-12 339903
2 2 1 ⁄
2
-12 459300