Titan IMPACT 840 Service Manual page 10

MAINTENANCE
During reassembly, make sure the Viton o-rings
i
and the PTFE back-up rings between the upper
housing and lower housing as well as between
the lower housing and the foot valve housing are
lubricated with grease and in position.
REPACKING THE FLUID SECTION
1.
Remove the foot valve assembly
and the lower housing usxxxing the
steps in the "Servicing the Valves"
procedure above.
The outlet valve does not
i
need to be disassembled
from the piston rod for
this procedure.
2.
Tap the knock-off nut with a
soft hammer so that it turns
counterclockwise and loosens.
3.
Turn the fluid section
counterclockwise to remove it from
the gear box housing.
4.
Place the upper housing upright in a
vise by clamping on the wrench flats.
Do not over-tighten the
i
vise. Damage to the
upper housing may occur.
5.
Using a wrench, remove the upper
seal retainer.
6.
Slide the piston rod forward until
the piston is out of the T-slot on the
slider assembly.
7.
Pull the piston out through the
bottom of the upper housing.
8.
Inspect the piston rod for wear and
replace if necessary.
9.
Remove the upper and lower packings from the upper housing.
Be careful not to scratch, score, or otherwise
i
damage the upper housing during removal of the
packings.
10.
Clean the upper housing. Inspect the upper housing for damage
and replace if necessary.
11.
Remove the plastic wrap from the upper packing and pre-form
tool.
Cut the plastic wrap with a scissors. Do not cut
plastic wrap with a utility knife as damage can occur
to the O-rings.
Attention
10
12.
Slide the upper packing off the sizing/ insertion tool (towards the
tip) and install into the top of the upper housing with the raised
lip on the packing facing down.
13.
Insert the spacer on top of the upper
packing.
14.
Thread the upper seal retainer into the
upper housing and torque to 25-30 ft.
lbs.
15.
Pre-form the lower packing using the
Crankshaft
lower packing sizing tool (included in the repacking kit).
16.
Insert the lower packing partially into
the bottom of the upper housing
Slider
so that the side that has the o-ring
Assembly
closest to the face of the packing
faces up.
17.
Push the lower packing into position
using the lower packing insertion
Knock-O
Nut
tool (see Fluid Section Assembly
parts list for lower packing insertion
Upper Seal
tool P/N).
Retainer
18.
Place the piston insertion tool (included in the repacking kit) over
Spacer
the top of the piston rod.
19.
Insert the piston rod into the bottom of the upper housing,
Upper
Packing
through the lower packing, through the upper packing, and out
through the upper seal retainer.
When repacking the fluid section, make sure the
Upper i
raised lip on the bottom of the lower packing is
Housing
fully outside the packing around the piston rod
after insertion of the piston rod.
Lower
20.
Remove the piston insertion tool from the top of the piston rod.
Packing
21.
Slide the top of the piston rod into the T-slot on the slider
Wear Ring
assembly.
22.
Turn the knock-off nut counterclockwise until it is flush against
the upper housing.
Piston Rod
23.
Lubricate the threads on the upper housing with anti-seize
compound. Remove the upper housing from the vise.
24.
Thread the upper housing into the gear box housing, turning
clockwise.
25.
Continue to turn the upper housing clockwise until the knock-off
nut is flush against the gear box housing.
If the nipple on the upper housing does not face
i
the back of the unit, turn the upper housing
counterclockwise until the nipple faces the back of
the unit. Do not turn the upper housing more than
one full turn.
26.
Once the nipple is positioned, turn the knock-off nut clockwise
until it contacts the gear box housing.
27.
Tap the knock-off nut with a soft hammer to tighten it against the
gear box housing.
28.
Making sure that the Viton o-ring and PTFE back-up ring are
lubricated and in place, thread the lower housing into the upper
housing. Using two wrenches, hold the upper housing at the
IMPACT 840
Install upper packing
with raised lip
facing down.
Raised Lip
Install lower packing with
the side that has the o-ring
closest to the face of the
packing facing up.
Closer
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