Enerpac HMT Series, Operation And Maintenance Manual

20

L4478_a

7.3.3  HMT HLP Cassette Assembly - 

Disassemblyand Reassembly (Fig. 20/ 21)

•  With the HLP cassette laid down on it side, remove 

the three front spacer screws (12) and two reaction 

block screws (13) followed by the one of HLP 

cassette side plate (1 or 2).

•  Separate the ratchet bush (14). The drive plate 

assembly is free to be removed from the cassette. 

Carefully remove the two compression springs (8) 

from the drive plate and set to one side.

•  Remove the ratchet (4), pawl (5) and pawl  springs 

(6).

•  Disengage the two drive pin retainers (9), and slide 

out the drive pin (7) from the drive plate 

(3)

.

•  On the remaining plate remove the three front 

spacer screws (12) and two reaction block screws 

(13) separate front spacer (11) and reaction block 

(10) from the remaining HLP cassette side plate (1 

or 2).

•  Disassemble the reaction block by removing the 

two socket head cap screws (17), and remove the 

wear plate (16) from reaction block spacer (10).

•  Clean all components with a mild solvent.
•  Inspect all parts for damage. Any damaged 

components must be replaced.

•  Dry all components. Apply a thin coat of 

molybdenum disulphide grease in the areas shown 

in Figure 20.

Be sure that the ratchet, drive plate, 

pawl, pawl  spring, square drive, access plugs, and 

compression springs are correctly installed, in the 

reverse order of disassembly. Failure to install these 

parts correctly will result in component damage. Refer 

to figures 19 and 20.

•  Assemble the HLP cassette assembly to the 

appropriate drive unit body.

•  Connect the wrench to the pump and perform 

hydraulic pressure testing before placing the wrench 

into service. Refer to the procedure in Section 7.2.6.

•  Without the wrench on a nut or bolt, check 

operation at a nominal pressure to make sure the 

piston advances and retracts freely.

•  Release the pressure and make sure that the piston 

fully retracts.

NOTICE

7.3.4  HMT HSQ Cassette Assembly - 

Disassemblyand Reassembly (Fig. 22/ 23)

•  To separate the square drive reaction arm (4), 

unscrew the securing reaction arm grub screw (20) 

and disengage. 

•  Remove the square drive circlip (8) and slide 

the reaction arm spline (3) off the square drive 

(2). Separate the drive bush (6) and remove the 

remaining reaction arm circlip (9).

•  Remove the square drive (2), drive retainer ring (21), 

retainer block (5), and push button retainer (16).

•  Remove the front spacer pins (22) followed by the 

front spacer (15). 

•  The drive plate assembly is free to be removed 

from the body. Carefully remove the two rod end 

pin spring (18) from the drive plate and set to one 

side.

•  Disengage the two drive pin retainers (19), and 

slide out the rod end pin (10) from the drive plate 

(11)

.

•  Remove the splined ratchet (7), pawl (

14

) and pawl 

springs (13).

•  If the linkpin (12) requires replacement, unscrew 

the M4 button head screw (24) and separate link 

pin and lanyard (23) from the body. 

•  Clean all components with a mild solvent.
•  Inspect all parts for damage. Any damaged 

components must be replaced.

Do not apply molybdenum disulphide 

grease to the ratchet lever bore, or to the drive shoe 

teeth. Application of grease to these areas will cause 

erratic operation, slippage of drive mechanism and 

excessive component wear.

•  Dry all components. Apply a thin coat of 

molybdenum disulphide grease in the areas shown 

in Figure 22.

Be sure that the ratchet, drive plate, 

pawl, pawl spring, square drive, access plugs, and 

compression springs are correctly installed, in the 

reverse order of disassembly. Ensure that the square 

drive is inserted through the drive plate. Failure to install 

these parts correctly will result in component damage. 

Refer to figures 21 and 22.

•  Assemble the Square Drive Cassette assembly to 

the appropriate wrench body.

•  Connect the wrench to the pump and perform 

hydraulic pressure testing before placing the wrench 

into service. Refer to the procedure in Section 7.2.6.

•  Without the wrench on a nut or bolt, check 

operation at a nominal pressure to make sure the 

piston advances and retracts freely.

•  Release the pressure and make sure that the piston 

fully retracts.

NOTICE

NOTICE