H8508 Hydraulic Impact Wrench
Greenlee / A Textron Company
19
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
Figure 3
Torque Sequence
When assembling parts, refer to the Illustrations and
Parts Lists for correct orientation and placement of parts.
Clean grease and oil from all parts (take care to protect
eyes), then dry thoroughly. Do not expose O-rings or
other packing components to cleaning agent for long
periods of time.
Inspect all parts as they are assembled for signs of
damage, wear, cracks, etc. Do not install any parts
which appear to be damaged.
Apply hydraulic fluid or O-ring lubricant to all O-rings and
all metal surfaces which O-rings must slide over. When
installing an O-ring over a sharp edge, use a rolling
action to avoid damage to O-ring.
Wherever assembled parts cause metal-to-metal con-
tact, coat the surfaces with hydraulic fluid or O-ring
lubricant.
Motor (See Figures 6, 7 and 9)
1.
Install new O-ring (4) and back-up ring (5) into drive
shaft opening of handle (1) using an O-ring tool.
Be careful, do not damage O-ring during installation.
2.
Lubricate drive shaft (8) and slide into opening in
handle (1) through the O-rings and back-up ring from
impact mechanism side of tool.
3.
Install Woodruff key (9) and one gear (10) onto drive
shaft (8), guiding keyway in gear (10) over Woodruff
key (9). Fasten gear to drive shaft with retaining clip
(11).
4.
Install drive pin (12) into idler shaft (13), if removed.
Slide remaining gear (10) onto idler shaft (13),
guiding keyway in gear (10) over drive pin (12).
Install idler shaft and gear into handle (1), meshing
the two gears (10) together. Use retaining clip (11) to
restrain lateral movement of idler shaft.
5.
Install dowel pins (14) into handle (1) if removed.
Install new gasket (15).
6.
Install motor cap (6) onto handle (1).
7.
Secure motor cap (6) to handle (1) with cap screws
(16). Torque cap screws (16) to 80 inch-pounds.
Follow torque sequence shown in Figure 3.
Reversing Spool (See Figure 5)
1.
Install O-ring (25) onto reversing spool (19).
Replace O-ring (26) in handle (1).
2.
Install O-ring (30) on plug (22). At O-ring end of
spool (19) install poppet (20), spring (21) and plug
(22). Secure assembly with cap (24).
3.
Slide reversing spool assembly into handle (1), as
shown in Figure 5.
4.
Install poppet (20), spring (21) and plug (22) into
opposite end of spool (19). Secure with cap (24).
Use two wrenches on cap (24) and tighten to
23 foot-pounds.
Trigger, Trigger Spool, and
Open-Center/Closed-Center Spool
(See Figures 7 and 8)
48330/48329 prior to S/N 300 (See Figures 4 and 7)
1.
Install O-ring (34) (O-ring (30) prior to S/N 300) on
open-center/closed-center spool (31). Install ball (32)
in trigger spool (29) cavity. (No ball (32) prior
to S/N 300.) Install open-center/closed-center spool
(31) into trigger spool (29). Secure with snap-ring
(33).
2.
Install O-ring (35) onto trigger spool assembly.
Replace O-ring (27) and back-up ring (28) in
handle (1).
3.
Slide trigger spool assembly as shown in Figure 4
or 8 into handle (1) from trigger side of tool.
48330/48329 prior to S/N 300 (See Figures 4 and 7)
Note: Slots in trigger spool (29) must be facing handle
end of tool.
1.
Slide washer (36) onto trigger spool (29) and secure
with snap-ring (37).
2.
Slide spring (38) and washer (39) onto trigger
spool (29).
3.
Secure trigger (41) to trigger spool (29) with spring
pin (42).
4.
Secure link (40) to handle (1) and trigger (41) with
spring pins (42).
Note: Support trigger (41) so pressing or tapping on
spring pins (42) does not bend trigger spool (29).
Assembly (cont’d)
1
3
4
2
5
7
8
6
