Bearing Housing & Connecting Rod - Graco LineLazer IV 3900 Series Repair Parts List Manual

Bearing Housing and Connecting Rod
Removal
1. Relieve pressure, page 7.
2. Fig. 2. Remove screws (187) and front cover (83).
3. Unscrew suction tube (34) from pump, hold
wrench on pump intake valve (A) to keep pump
from loosening.
4. Disconnect pump outlet hose (100) from displace-
ment pump outlet nipple (60).
5. Fig. 1. Use screwdriver to push up retaining spring
(236) at top of pump. Push out pin (235).
235
236
Fig. 1
6. Fig. 2. Loosen retaining nut (84). Unscrew and
remove displacement pump (21).
7. Remove four screws (183) and lockwashers (173)
from bearing housing (22).
8. Pull connecting rod (26) and lightly tap lower rear
of bearing housing (22) with plastic mallet to
loosen from drive housing (24). Pull bearing hous-
ing and connecting rod assembly (26) off drive
housing.
9. Inspect crank (B) for excessive wear and replace
parts as needed.
Installation
1. Evenly lubricate inside of bronze bearing (C) in
bearing housing (22) with high-quality motor oil.
Liberally pack top roller bearing (E), lower bearing
(D) inside connecting rod assembly (26) with
bearing grease.
2. Assemble connecting rod (26) and bearing
housing (22).
3. Clean mating surfaces of bearing and drive hous-
ings.
4. Align connecting rod with crank (B) and carefully
align locating pins (F) in drive housing (24) with
holes in bearing housing (22). Push bearing hous-
ing onto drive housing or tap into place with plastic
mallet.
DO NOT use bearing housing screws (183) to align
or seat bearing housing with drive housing. Align
these parts with locating pins (F), to avoid prema-
ture bearing wear.
5. Install screws (183) and lockwashers (173) on
bearing housing. Torque evenly to note 3 value in
Fig. 2.
6. Install pump. Refer to Displacement Pump,
Installation, page 21.
2
D
83
236
7675B
183
3
187
235
21
Oil
1
2 Pack with bearing grease 114819
LineLazer IV 3900/R300: Torque to 200 in-lb
3
(22.6 N¡m)
Fig. 2
CAUTION
B
2
E
F
26
3
C
173
1
100
A
60
LineLazer V 5900: Torque to 25 ft-lb
Model 248862 shown
ti6395a
24
22
34g
84
34
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