4
NOTICE
Some residual oil will be contained in cylinder tube.
Dispose of any used oil in accordance with all applicable laws
and regulations.
3.3 Piston Seal Removal
1. Place the pump on a workbench or other substantial work
surface.
2. Pry and remove wear band (Figure 4, Item 2) starting at the
scarf cut (Figure 4, Item 1).
3. Repeat step 1 for second wear band.
4. Using same non-marring blade, pry up outer piston seal
(Figure 4, Item 3). While retaining the seal with blade,
rotate the blade around the piston until the outer piston
seal is loose. Remove outer piston seal.
5. Remove inner piston seal O-ring (Figure 5, Item 1) that was
exposed in step 4.
3.4 Piston Seal Replacement
1. Using a clean, lint-free rag, remove old grease and seals
(Figure 4, Item 1) from end cap (Figure 4, Item 2).
2. Using a small brush, lightly grease piston grooves and
seals before installation.
3. Install inner piston seal O-ring (Figure 5, Item 1) on piston.
4. Install outer piston seal (Figure 4, Item 3) on top of inner
piston seal O-ring (Figure 5, Item 1).
5. Install wear band on piston (Figure 4, Item 2).
3.5 End Cap Seal Removal and Replacement
Perform steps 1 through 3 for each end cap:
1. Using a clean, lint-free rag and suitable cleaning agent,
remove old grease and seal (Figure 6, Item 1) from end cap
(Figure 6, Item 2).
2. Using a small brush, lightly grease grooves and seals
before installation.
3. Install end cap seal on end cap with care so as not to tear
the seal.
3.6 Rod Seal Removal
1. Secure end cap assembly in a non-marring vise with the
seals accessible.
2. Identify the two peening indentations (Figure 7, Item 1).
3. Using a 1/8" inch drill bit, drill an approximately 1/8" deep
hole at each peening indentation.
1
2
3
2
Figure 4, Piston Seal Removal (View 1 of 2)
1
Figure 5, Piston Seal Removal (View 2 of 2)
1
2
Figure 6, End Cap Seal Removal
11
Figure 7, Peening Indentations
Summary of Contents for DuroTech Series
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