Assembly; Disassembly - Greenlee fairmont H8508 Instruction Manual

Disassembly (cont'd)
Trigger and Control Spool—48696
(See Figures 7 and 8)
48273 (48330/48329 prior to S/N 300)
(See Figures 4 and 7)
1. Remove spring pin (42) from trigger spool (29) by
pressing or tapping with a hammer and punch.
Note: Support trigger (41) so pressing or tapping
does not bend trigger spool (29).
2. Remove washer (39), spring (38), snap ring (37),
and washer (36). Trigger spool (29) may now be
pushed out of handle (1). Push spool toward trigger
side of tool.
3. Remove snap ring (33). open-center/closed-center
spool (31) may now be removed to service O-ring
(34). (O-ring [30] prior to S/N 300)
4. Ball (32) is loose in this assembly. Take caution to
catch ball when it falls free. (No ball [32] prior to
S/N 300)
Reversing Spool
1. Remove reversing spool (19) by loosening and
removing cap (24) on left side of tool and pulling
spool (19) out right side of tool.
Note: For tool orientation (left and right) grip tool as
you would use it and view tool looking at motor cap
(6). See Figure 6.
Note: Attempting to push the reversing spool (19)
the opposite way through the bore will cause
damage to O-rings (25 and 26) and could allow
particles of O-ring to get into motor.
2. Remove plug (22), spring (21) and poppet (20).
3. Repeat procedure for right side of reversing
spool (19).
Note: If set screws (23 and 60) have not been
disturbed and internal components are returned to
the same side of spool (19),the relief valve setting
may not have been affected and tool will perform
properly when assembled.
Note: Relief valve setting may require checking
when tool is reassembled.
Greenlee / A Textron Company
H8508 Hydraulic Impact Wrench

Assembly

Inspection
1. Motor Cap (6) and Handle (1). Mating surfaces, gear
cavities, oil passageways, etc.; must be smooth and
free of grooves or nicks. If either component has
grooves or nicks, replace the component as an
assembly with the bearings already pressed in.
2. Drive Shaft (8), Idler Shaft (13) and Gears (10). All
surfaces, including gear teeth, must be smooth and
free of grooves or nicks. If any component is
damaged, replace the component.
3. Bearing (3 and 7). Hold motor cap or handle assem-
bly in one hand or place on a flat surface. Insert
drive shaft (8) or idler shaft (13) into bearing. Spin
the shaft. The shaft should turn smoothly. If any
roughness is noted, Fairmont recommends replacing
the component as an assembly with the bearings
already pressed in.
4. Bearing (56) in hammer case cap (55). Slide anvil
(49) into bearing (56). Turn anvil (49). The anvil
should turn smoothly. If any roughness is noted,
check anvil surface. If problem is the bearing sur-
face, replace hammer case cap assembly as an
assembly with the bearing already pressed in.
5. Thrust bearing (43) and thrust washers (44). Turn
bearing on washer surfaces. Bearing should roll
smoothly. If any roughness is felt, replace the
components.
6. Trigger Spool (29). All surfaces must be free of
grooves or nicks. If the component has grooves or
nicks, replace the component.
7. Reversing Spool (19). All surfaces must be free of
grooves or nicks. If the component has grooves or
nicks, replace the component.
8. Hammer Frame (46), Anvil (49), Hammers (47) and
Pins (48). All surfaces must be free of grooves,
nicks, or cracks. If any component has grooves,
nicks, or cracks, replace the component.
9. O-rings. Always replace O-rings in components that
have been disassembled with new O-rings during
assembly. A packing kit is available that includes all
O-rings and gaskets.
10. Gasket (15). Always replace gaskets when motor
cap or hammer case is removed from handle
assembly. Install new gasket (15).
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