Hitachi 308996J - Manual (Page 12)

12 308996
Service
Required Tools
D
Set of adjustable wrenches
D
Torque wrench
D Vise
D Thread lubricant
Disconnecting Displacement Pump
1. Fig. 3. Flush pump, if possible. Stop pump at
bottom of its stroke.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
2. Relieve the pressure.
3. Disconnect air hose and fluid hose.
4. Disconnect displacement pump (109) from motor
(101) as follows. Note relative position of pump’s
fluid outlet (U) to air inlet (V) of motor. If motor
does not require servicing, leave it attached to its
mounting.
CAUTION
If you are disconnecting the displacement pump from
a motor which is still mounted (for example, on a wall
bracket), be sure to support the displacement pump
while it is being disconnected, to prevent it from
falling and causing injury or property damage.
5. Using needle nose pliers, remove cotter pin (107)
from clevis pin (106). Remove clevis pin from
displacement rod (1).
6. Hold tie rod flats with wrench to keep rods from
turning. Unscrew nuts (108) from tie rods (105).
Carefully remove displacement pump (109) from
motor (101).
7. Refer to page 14 for displacement pump service.
To service air motor, refer to separate motor
manual, 308995.
Reconnecting the Displacement Pump
1. Fig. 3. Reconnect displacement pump (109) to
motor (101) (see CAUTION at left). Orient pump’s
fluid outlet (U) to air inlet (V) as noted in step 4
under Disconnecting the Displacement Pump.
Position displacement pump (109) on tie rods (105).
2. Insert clevis pin (106) through piston rod (W) and
displacement rod (1). Install cotter pin (107).
3. Screw nuts (108) onto tie rods (105) and tighten.
4. Reconnect all hoses. Reconnect ground wire if
disconnected. Fill wet cup (2) 1/3 full of Graco
Throat Seal Liquid or compatible solvent.
5. Turn on air supply. Run pump slowly to ensure
proper operation.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.