Graco 308149P Service, Required Tools, Disconnecting the Displacement Pump

Service

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 12.

Required Tools

DTorque wrench

DBench vise, with soft jaws

DRubber mallet

DHammer

DO-ring pick

D13 mm (1/2 in.) dia. brass rod

DSet of socket wrenches

DSet of adjustable wrenches

D24 in. adjustable wrench

DThread lubricant

DThread sealant

DLoctiteR 2760t or equivalent

NOTE: Service Tool 109508 is available as an acces- sory. The tool fits over the top of the displacement rod, making it easier to apply a 24 inch adjustable wrench or 3/4 in. drive socket when connecting or disconnect- ing the rod from the piston assembly.

Disconnecting the Displacement Pump

WARNING

Keep hands and fingers away from the priming piston during operation and whenever the pump is charged with air/hydraulic fluid to reduce the risk of injury! On the pump downstroke the priming piston extends beyond the intake housing to pull the material into the pump. The priming piston works under extreme force. During operation and when- ever the pump is charged with air/hydraulic fluid, the priming piston can severely injury or amputate a hand or finger, or break a tool, caught between it and the intake housing. Always relieve the pres- sure before checking, clearing, cleaning, flushing, or servicing any part of the pump.

On King and Bulldog air-powered pumps, the air motor piston (located behind the air motor shield) moves when air is supplied to the motor. Never operate the pump with the air motor shield re- moved.

On Premier air-powered pumps, the rocker arms (located beneath the rocker arm covers) move when air is supplied to the motor. Never operate the pump with the rocker arm covers removed.

Before servicing the pump, relieve the pressure to prevent the pump from starting accidentally.

16 308149

1.Flush the pump, if possible. Stop the pump at the bottom of its stroke. Relieve the pressure.

2.Disconnect the air or hydraulic hose. Plug all hydraulic hoses immediately, to prevent contami- nation of the hydraulic system. Hold the fluid outlet fitting (20) with a wrench to keep it from being loosened while you disconnect the fluid hose.

3.Disconnect the displacement pump (105) from the motor (101) as follows. Be sure to note the relative position of the pump’s fluid outlet to the air or hydraulic inlet of the motor. 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.

4.Using an adjustable wrench, unscrew the coupling nut (103). Remove the coupling collars (108). Take care not to lose or drop them. See Fig. 6.

5.Hold the tie rod flats with a wrench to keep the rods from turning. Unscrew the nuts (106) from the tie rods (107). Carefully remove the displacement pump (105) from the motor (101).

6.Refer to page 19 for displacement pump service. To service the air or hydraulic motor, refer to the separate motor manual, supplied.