Hitachi ZAXIS 250LC-7 Operator's Manual page 47

Arm Installation
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WARNING:
 NEVER insert your fingers into pin holes when
aligning the pin holes.
 Guard against injury from flying pieces of metal.
Wear goggles or safety glasses, and safety
equipment appropriate to the job.
 To prevent personal injury, do not allow any person
under the arm before inserting the pin.
1. Set the boom end at 1.5 m above the ground by
operating the boom control lever.
2. Bleed air from arm cylinder (21). Run the engine at slow
idle speed; slowly operate the arm control lever to fully
extend and retract arm cylinder (21).
Repeat this procedure until arm cylinder (21) moves
smoothly.
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CAUTION: Do not let the piston rod hit obstacles
when it extends.
3. Hoist arm (22) by using a crane.
Arm weight:
Model Type
HE15LD
ZX250LC(N)-7
HE18LD
HE15LD
ZX300LC(N)-7
HE18LD
HE15LD
HE18LD
ZX350LC(N)-7
HE20LD
HE22
4. Align the hole on arm (22) and hole on the boom. Install
shims and pin (23), and then install the retaining bolt.
Tightening Torque:
Model
HE15LD
ZX250LC(N)-7
HE18LD
HE15LD
ZX300LC(N)-7
HE18LD
HE15LD
HE18LD
ZX350LC(N)-7
HE20LD
IMPORTANT: Take care not to damage the dust seals in
this procedure.
If the shims are not installed, it generates play on left
and right side, which can damage the pin and holes.
DISASSEMBLING • ASSEMBLING
Arm Weight
1780 kg
1760 kg
1950 kg
1970 kg
2060 kg
2130 kg
2310 kg
2330 kg
Type Tightening Torque
400 N·m (40 kgf·m)
750 N·m (75 kgf·m)
HE22
Pin Weight
38 kg
43 kg
49 kg
4-13
22
21
1.5 m
23
M1T1-SL1-003