Hydraulic Motor - Graco GH 733 HYDRA-SPRAY Instructions-Parts List Manual

PROBLEM
The fluid delivery
is
low.
The material coating is too thick.
There is spitting from the
dispensing valve.
CAUSE
The pressure setting is too low.
The pump outlet filter (if used)
is dirty or clogged.
The hydraulic pump isworn or
damaged.
The hydraulic motor is worn or
damaged.
There is a large pressure drop in
the material handling hose.
The spray tip is too big or it is
worn.
The paint supply is low or
The dispensing valve is not
closing properly.
empty.
Check everything in the Troubleshooting Chart before
disassembling the unit.
*Check the hydraulic fluid level often. Do not allow it to
fluid; see the ACCESSORIES section.
become too low. Use only Gmco approved hydraulic
Solvent flush the material from the pump, if possible.
Then shut off the engine, trigger the spray gun and
engage the trigger safety to relieve the fluid pressure.
Hydraulic Motor
CAUTION
Cleanliness is essential when repairing hydraulic
dirt into the motor during servicing.
motors. Use special care to avoid getting dust or
See instruction manual 307-158 for motor service.
To remove the hydraulic motor, disconnect all hoses
the hoses to keep dirt out. Remove the three
tie rod
(84,86,88)
from the motor. See Fig 8. Plug the ends of
nuts (101). Support the displacement pump and
ter pin
(99)
and remove the pump. Unscrew the five
unscrew the connecting rod nut
(100).
Remove the cot-
frame (17). Lift the motor straight up. The tie rods (133)
capscrews (36.95) from the bottom side of the pump
will pass through the holes in the frame's mounting
plate. See Fig 8.
CAUTION
Support the engine on
2
x
4 ' s
when removing the
motor to prevent the unit from tipping.
SOLUTION
Increase the pressure.
Clean the filter.
Replace the pump. See page 11.
Service the motor. See manual
307-158.
Use
a
larger diameter hose.
Change the tip.
Refill the supply container.
Service the valve.
Fig
8
307465
9