5-4 673831-Rev A
HYDROSTATIC POWER TRAIN
5
Hydraulic Hose, Tube, and Fitting
General Instructions
O-Ring Installation
• Always install new O-rings.
• On hoses with O-ring fittings, make sure O-rings are
properly seated before tightening.
• O-rings should be lubricated with the fluid to be used
in the system prior to assembly.
Boss Fitting O-Ring Installation
O-Ring Seal Kits
• SAE Boss O-Ring Kit Jacobsen PN 5002452
• O-Ring Face Seal (ORS) O-Ring Kit PN 5002454
• Common O-Ring Sizes Kit PN 5002453
Replacement O-Rings for ORS (Face Seal)
Fittings
Replacement O-Rings for O-Ring Boss
Fittings
Hydraulic Hose Installation
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 the hose to twist; hold
the hose in a normal straight position.
When installing hoses, place fittings at angles to avoid
contact with fixed parts when turning. Make sure hoses
are assembled to proper “A” and “B” ports on
components.
Hydraulic Hose and Tube Torque Values
1 Tubing O.D. or Hose I.D. 2 O-Ring 3 Thread Size
ORS (Face Seal)
Tube Size
ORS (Face Seal)
O-Ring Size
Jacobsen
Part
Number
4 11 339908
6 12 339909
8 14 339910
10 16 339911
12 18 339912
16 21 339913
20 25 339914
24 29 339915
Tubing O.D.
or Hose I.D.
Thread
Size
Jacobsen Part
Number
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
Size lb-ft N·m
Dash Fractional Min Max Min Max
-4 1/4 10121416
-6 3/8 18 20 24 27
-8 1/2 32404354
-10 5/8 46 56 60 75
-12 3/4 65 8090110
-16 1 92 105 125 240
-20 1-1/4 125 140 170 190
-24 1-1/2 150 180200246
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