
11
I M P O R T A N T
Check the tool against daily and weekly servicing.
Priming is ALWAYS necessary after the tool has been dismantled and prior to operating.
* refers to items included in the Avdel service kit. For complete list see page 10.
HYDRAULIC PISTON ASSEMBLY
With spring compressor* held in vice, compress spring
17
, applying clamp screw ball-end to head piston plug
2
.
Using circlip pliers* remove circlip
3
.
Unscrew clamp and remove the head piston plug
2
and spring
17
.
Using spanner assembly for head piston* and a spanner* unscrew jaw spreader housing assembly
10
and withdraw piston
16
.
Assemble in reverse order to dismantling.
Use ‘O’ ring assembly tool* and plug* when renewing ‘O’ rings.
If for any reason jaw spreader housing assembly
10
is removed from piston
16
, a new jaw spreader housing assembly must be fitted
onto the piston and tightened with a torque of 20 lb.ft./9.1 kg.m. to the dimension shown on th general assembly drawing for the
tool in question.
AIR PISTON ASSEMBLY
Remove internal circlip
33
and pull out base plate
34
.
Engage piston extractor* with piston rod
26
and pull out piston assembly
25
.
Unscrew piston rod nut
31
and remove washer
30
, air piston cup
29
, washer
28
and buffer
27
.
Assemble in reverse order to dismantling.
AIR VALVE
Using a spanner* unscrew female adaptor
36
.
Remove valve spring
39
, valve
40
, spring
41
, valve plunger
44
and valve operating rod
45
.
Assemble in reverse order to dismantling, paying particular attention to sealing face of valve
40
and seal diameter of valve plunger
44
for marks and scratching.
ADAPTOR ASSEMBLY
Grip tool lightly in a vice fitted with soft jaws.
Remove piston assembly
25
as described earlier.
Using socket assembly*, ‘T’ handle extension*, lift out adaptor assembly
19
and washer
23
.
Remove ‘O’ rings
20
&
18
, back up rings
21
&
52
.
Assemble in reverse order to dismantling, ensuring ‘O’ rings and back up rings are replaced in correct positions.
TRIGGER TIE REPLACEMENT
Using pin punch* drift out pin
55
.
Remove screws
53
and pull off trigger guard
56
.
Unbend trigger tie loop at trigger cam lever
51
and disengage.
Assemble in reverse order to dismantling.
Introduce free end of trigger tie into slot in trigger mounting and insert angled end of trigger tie into trigger cam lever
51
.
Bend trigger tie over cam lever
51
, making sure it pivots freely.
Position trigger guard
56
on handle
1
, insert screws
53
and tighten.
Line up trigger assembly
54
with trigger guard
56
and insert new pin
55
. Check free movement of trigger assembly.
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