Groundsmaster 4300--D Hydraulic SystemPage 4 -- 7
Adjustable Fitting (Fig. 8)
1. Make sure all threads and sealing surfaces of fitting
and component port are free of burrs, nicks, scratches
or any foreign material.
2. Asapreventativemeasureagainstleakage,itisrec-
ommended that the O--ring be replaced any time the
connection is opened.
3. Lightly lubricate the O--ring with clean hydraulic oil.
Fittingthreadsshouldbecleanwithnolubricantapplied.
4. Turnback thelock nut asfar as possible. Makesure
the backup washer isnot loose andis pushed upas far
as possible (Step 1 in Figure 9).
IMPORTANT: Before installing fitting into port, de-
termine port material. If fitting is to be installed into
an aluminum port, installation torque is reduced.
5. Install the fitting into the port and tighten finger tight
until the washer contacts the face of the port (Step 2 in
Figure 9). Make sure that the fitting does not bottom in
the port during installation.
6. Toputthefittinginthedesiredposition,unscrewitby
the required amount to align fitting with incoming hose
or tube, but no more than one full turn (Step 3 in Figure
9).
7. Hold the fitting in the desired position with a wrench
and use a torque wrench to tighten the lock nut to the
recommended installation torque shown in Figure 7.
This tightening process will require the use of an offset
wrench (e.g.crowfoot wrench).Use ofan offsetwrench
will affect torque wrench calibration due to the effective
length change of the torque wrench. Tightening torque
when using a torque wrench with an offset wrench will
be lower than the listed installation torque (see Using a
Torque Wrench with an Offset Wrench in the Torque
Specifications section of Chapter 2 -- Product Records
and Maintenance).
8. If a torque wrench is not available, or if space at the
portpreventsuseofatorquewrench,analternatemeth-
od of assembly is the Flats From Finger Tight (F.F.F.T.)
method. Hold the fitting in the desired position with a
wrench and, if port material is steel, tighten the lock nut
witha secondwrench tothelisted F.F.F.T(Step4 inFig-
ure9).If portmaterialisaluminum,tighten fittingto60%
of listed F.F.F.T.
Size F.F.F.T.
4 (1/4 in. nominal hose or tubing) 1.00 +
0.25
6(3/8in.) 1.50+
0.25
8(1/2in.) 1.50+
0.25
10 (5/8 in.) 1.50 +
0.25
12 (3/4 in.) 1.50 +
0.25
16 (1 in.) 1.50 +
0.25
Figure 8
Lock Nut
Back--up Washer
O--ring
Figure 9
Step 3Step 1
Step 2 Step 4
Hydraulic
System
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