Tightening And Torque Recommendations For Hydraulic Couplings And Hoses - Skyjack SJ3219 Service Manual

Section 5 – Procedures
5.3-5 Tightening and Torque
Recommendations for Hydraulic
Couplings and Hoses
General Work Practices
1. All components must be free of damage or
contamination. O-rings cannot be reused
anytime the component has been installed
beyond finger tight. Clean or replace
components, as required.
2. Over-tightening a coupling may result in
overstressing and/or cracking, and may lead to
leaking or failure.
3. When tightening hose couplings, make sure the
hose does not twist on the adapter. Twisting will
shorten hose life and scar the sealing surfaces
of swivel type couplings (JIC, 45°, etc.), which
can create leaks.
4. When tightening hose couplings, use a torque
wrench (with crow's foot) on the hose end
hex swivel nut, and a standard box wrench on
the hose end stem hex to hold the hose from
twisting.
Box
Wrench
5. Lubricate all o-ring surfaces with suitable
hydraulic oil prior to installation in the flange
head and o-ring seal grooves. This will minimize
the possibility of damage to the O-ring when
installed.
6. Install any 45° and 90° hydraulic hose ends
first, then align direction and tighten. Adjust
the swivel nut on the straight hose end before
tightening to create the desired flow.
212508ADA
109
Torque Wrench
with Crow's Foot
Torquing Using a Torque Wrench
1. This method is applicable for JIC (37°) and
FFOR (Flat Face O-Ring) hose ends and fittings,
wherever the components are accessible with
torque wrench / crow's foot tools.
2. Align the hose end or fitting to the mating
component.
3. Install the nut two or three turns by hand to
assure proper alignment. Jiggle the hose while
tightening to make sure the faces contact fully.
4. Using a properly calibrated torque wrench,
tighten the coupling using a smooth, even
motion until an indication (audible click) is
heard and felt. Do NOT over tighten. For
recommended torque values, refer to
Specifications for Hydraulic Couplings & Hoses.
5. Apply a drop of torque seal to the connection.
Torquing Using the Flats From Wrench Resistance
Method
1. This method is applicable for JIC (37°) and
FFOR (Flat Face O-Ring) hose ends only,
wherever the components are inaccessible
with torque wrench/ crow's foot tools, or when
a properly calibrated torque wrench is not
available.
2. Align the hose end or fitting to the mating
component.
3. Install the swivel hose end nut hand tight to the
fitting to assure proper alignment. Jiggle the
hose while tightening to make sure the faces
contact fully.
4. Tighten the nut using a box wrench until minor
resistance is felt.
Base
2.4 Torque
SJ3215, SJ3219