Toro Groundmaster 31900, Service Manual

Page: 93 / 355

Installing Hydraulic Hoses and Tubes (O-Ring Face Seal Fitting)
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Figure 19
1. Tube or hose
2. Swivel nut 3. O-ring
4. Fitting body
1. Ensure that all the threads, the sealing surfaces of the hose/tube, and the
fitting are free of burrs, nicks, scratches, or unwanted material.
2. To help prevent a hydraulic leak, replace the face seal O-ring when you open
the connection. Ensure that the O-ring is installed and correctly seated in the
groove of the fitting. Lightly lubricate the O-ring with clean hydraulic fluid.
3. Align the hose/tube against the body of the fitting so that the flat face of the
hose/tube sleeve fully touches the O-ring in the fitting ( Figure 19 ).
4. Use your hand to thread the swivel nut onto the fitting. While you hold the
hose/tube in alignment with a wrench, use a torque wrench to tighten the
swivel nut to the recommended torque value within the specified range of
torque values; refer to the
Hose/Tube Installation Torque Table (page 5–7) .
This procedure to tighten the swivel nut requires a drive-adapter wrench
(e.g., crowfoot wrench).
Note: It may be necessary to use a drive-adapter wrench (e.g., crowfoot
wrench) to install a hydraulic fitting; refer to Calculating the Torque Values
When Using a Drive-Adapter Wrench (page 2–8) .
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Figure 20
1. Mark nut and fitting body 2. Initial position 3. Final position
Hose/Tube Installation Torque Table
Fitting Dash Size
Hose/Tube Side Thread Size
(inch)—threads per inch)
Installation Torque
4 9/16—18 25 to 29 N∙m (18 to 22 ft-lb)
6 11/16—16 37 to 44 N∙m (27 to 33 ft-lb)
8 13/16—16 51 to 63 N∙m (37 to 47 ft-lb)
10 1—14 82 to 100 N∙m (60 to 74 ft-lb)
Groundsmaster ® 3200, 3300 and 3310 Page 5–7 Hydraulic System: General Information
19240SL Rev A