910193 - Hydraulic Impact Wrench
Phone: (262) 637-9681
4.2021 Rev 2.1
Page
20
of
30
Motor Housing Assembly
See Motor Housing & Valve Handle Assembly Drawing on page 28.
1. Lubricate and install the relief seat (7) in the valve spool (6) (notched end aligned with strut), followed
by the relief poppet (8), small spring (10) and spring seat (11).
See assembly drawings for correct orientation of the spring seat.
2. Set the large spring (9) on the open end of the reversing spool (29).
3. Slide the components assembled above into the valve handle assembly.
4. Lubricate and install the two O-rings (2 & 4) and rod wiper (1) on the spool cap (3).
5. Insert the headed push pin (5) into the spool cap.
6. Screw the spool cap (3) into the main housing. Tighten securely.
7. Install the trigger using the roll pin.
8. Lubricate and install the O-ring (41) in the relief adjustment screw bore in the motor housing.
9. Install the relief adjustment screw (42) with the jam nut (43) positioned near the screw head.
Install with the same number of turns counted when disassembled to maintain the correct impact
force. Tighten the jam nut (see
Impact Intensity Adjustment
).
10. Install the main shaft (17), idler gear (18) and idler shaft (15) in the motor housing.
11. Lubricate and install the large O-ring (16) in the groove of the motor housing.
12. Carefully slide the valve housing over the main shaft until it seats securely against the motor housing.
13. Lube with Loctite 242 and install the (8) socket head cap screws (24) and washers (23).
Tighten to a torque of 5 lbf-ft.
14. Lubricate and install the O-ring (32) on the main shaft (28). Install the back-up ring (33), back-up
washer (34) and retaining ring (35).
15. Grease the thrust bearing (40) and thrust washers (39) and install on the main shaft (28).
Install the hammer case O – ring (12) and replace the mechanism. See parts illustration for thrust
bearing part sequence.
16. Install the four socket head cap screws (57) and lock washers (56).
Tighten to a torque of 13-15 lbf-ft. [17.6-20.3 Nm].
17. Lubricate and install the O-ring (20) and back-up ring (21).
O-ring toward the center, then the back-up ring toward end, on the retaining ring end of the reversing
spool (29).
18. Slide the reversing spool (29) into the valve handle housing.
Install only far enough to install the O-ring (20) and back-up ring (21) on the lever side of the
reversing spool with the back-up ring toward the end.
19. Center the reversing spool and install the retaining ring (22).
20. Turn the reversing spool so the hole will be pointing up. Align the hole in the lever with the hole in the
reversing spool and install the lever (31).
Secure with the internal hex set screw (30). Tighten the set screw securely.
