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

Bearing Housing and Connecting Rod

Removal
1. Relieve pressure, page 6.
2. F . 2. Remove screws (187) and front cover (83).
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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. F . 1. Use screwdriver to push up retaining spring
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(236) at top of pump. Push out pin (235).
235
236
7675b
F . 1
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6. F . 2. Loosen retaining nut (84). Unscrew and
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remove displacement pump (21).
7. Remove four screws (183) and lockwashers (188)
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 housing 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 bear-
ing housing (22) with high-quality motor oil. Liberally
pack top roller bearing (E), lower bearing (D) inside
connecting rod assembly (26) with bearing grease.
312195B
Bearing Housing and Connecting Rod
2. Assemble connecting rod (26) and bearing housing (22).
3. Clean mating surfaces of bearing and drive housings.
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 housing onto
drive housing or tap into place with plastic mallet.
CAUTION
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 premature bearing wear.
5. Install screws (183) and lockwashers (188) on bear-
ing housing. Torque evenly to note 3 value in F
6. Install pump. Refer to Displacement Pump, Instal-
lation, page 21.
E
2
83
D
2
236
3
188
183
3
187
235
21
A
Model 253920
1
Oil.
2
Pack with bearing grease 114819.
3
LineLazer IV 3900: Torque to 200 in-lb (22.6 N•m).
LineLazer IV 5900: Torque to 25 ft-lb (34 N•m).
F . 2
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B
24
26
C
22
1
34g
F
100
60
34
TI6395A
. 2.
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84
11