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18 308351
Troubleshooting
PROBLEM CAUSE SOLUTION
Erratic or accelerated
pump speed.
Exhausted fluid supply. Refill and prime.
Fluid is too heavy for pump priming. Use the bleeder valve (see page 13 or 14); use a
ram.
Held open or worn piston valve or seals. Clear the valve; replace the seals.
Held open or worn priming piston. Clear; service.
Worn packings in the displacement
pump.
Replace the packings.
Service
Required Tools
D Torque wrench
D Bench vise, with soft jaws
D Rubber mallet
D Hammer
D O-ring pick
D 13 mm (1/2 in.) dia. brass rod
D Set of socket wrenches
D Set of adjustable wrenches
D Pipe wrench
D Packing nut wrench (109, supplied)
D Thread lubricant
D Thread sealant
Disconnecting the Displacement Pump
1. Flush the pump, if possible. Stop the pump at the
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 12.
2. Relieve the pressure.
3. Disconnect all hoses from the pump and motor.
4. Disconnect the displacement pump (106) from the
motor (101) as follows. See Fig. 6. Be sure to note
the relative position of the pump’s fluid outlet (X) to
the motor inlet (Y). If the motor does not require
servicing, leave it attached to its mounting.
CAUTION
Be sure to use at least two people when lifting,
moving, or disconnecting the pump. This pump is too
heavy for one person. If you are disconnecting the
displacement pump from a motor which is still
mounted (for example, on a ram), be sure to support
the displacement pump while it is being discon-
nected, to prevent it from falling and causing injury or
property damage. Do this by securely bracing the
pump, or by having at least two people hold it while
another disconnects it.
5. Using an adjustable wrench (or a hammer and
rod), unscrew the coupling nut (104) from the
motor shaft (Z). Do not lose or drop the coupling
collars (105). See Fig. 6.
6. Hold the tie rod flats with a wrench to keep the
rods from turning. Unscrew the nuts (103) from the
tie rods (102). Carefully remove the displacement
pump (106) from the motor (101).
7. Refer to page 20 for displacement pump service.
To service the motor, refer to the separate motor
manual, supplied.