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Removal
FLUID INJECTION
1.
HAZARD; page 3.
2. Relieve pressure; page 8.
3. Place drip pan or rags under sprayer to catch
hydraulic oil that leaks out during repair.
4. Fig. 7. Slide retainer clip (114) and magnet ring
(150) down to remove. Remove pump pin (126).
5. Remove hydraulic lines (161, 166) from fittings
(47) at top left and right side of hydraulic motor.
6. Loosen jam nut (144).
7. Unscrew and remove hydraulic motor cap (143).
8. Slide piston rod/hydraulic motor cap assembly (A)
from hydraulic motor cylinder.
9. Remove yoke (228).
a. Clamp hydraulic motor cap in vise with hydrau-
lic motor piston rod facing up.
b. Use shortened Allen wrench to remove two
screws (34) from spring retainer (237). Re-
move yoke, spring retainer, piston and trip rod
assembly from hydraulic motor cap.
MOVING PARTS HAZARD;
page 4.
Do not remove spring retainer (237) from yoke (228). If
yoke is worn, replace yoke and spring retainer assem-
bly with Yoke Repair Kit 246175.
c. Put yoke in vise. Remove set screw (228b)
and remove piston rod assembly from yoke.
Hydraulic Motor Yoke
Installation
1. Assemble yoke (228) to trip rod (228a)
a. Clean threads with primer or chlorinated sol-
vent and let dry 3 to 4 minutes. Apply thread
sealant to female threads of yoke. Clamp yoke
in vise and, with wrench on flats of trip rod,
screw trip rod into yoke. Torque to 55 in-lb (6.2
N·m). Install set screw (228b). Allow thread
sealant to dry for 3 hours prior to contact with
hydraulic fluid.
MOVING PARTS HAZARD;
page 4.
b. Fig. 7. Put hydraulic motor cap (143) in vise.
c. Install yoke, spring retainer, piston and trip rod
assembly in hydraulic motor cap. Use short-
ened Allen wrench to install two screws (34) in
spring retainer to secure piston rod assembly
to hydraulic motor cap.
2. Slide piston rod assembly (A) into hydraulic motor
cylinder.
3. Screw down hydraulic motor cap (143) until cap
bottoms out. Unscrew hydraulic motor cap until
inlet and outlet align with hydraulic line fittings and
test hole in hydraulic motor cap points toward belt
guard (223).
4. Torque jam nut (144) against hydraulic motor cap
(143) to 150 ft-lb (17 N·m).
5. Install hydraulic lines (161, 166) to fittings (47) to
top left and right side of hydraulic motor per proce-
dure on page 7; torque to 40 ft-lb (54.2 N·m).
6. Pull start rope slowly to align pin holes of hydraulic
motor and displacement pump (111). Connect with
pump pin (126); install retainer clip (114), page 24.
7. Start engine and operate pump for 30 seconds.
Turn engine OFF. Check hydraulic oil level and fill
with Graco hydraulic oil, page 8.
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