Bearing Housing And Connecting Rod; Removal; Installation - Graco LineLazer IV 3900 Repair And Parts 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 tub (34) from pump, hold wrench
on pump intake valve (A) to keep pump from
loosening.
4 Disconnect pump outlet hose (100) from
displacement pump outlet nipple (60).
5 Fig. 1. Use screwdriver to push up retaining spring
(236) at top of pump. Push out pin (235).
235
Fig. 1
6 Fig. 2. Loosen retaining nut (84). Unscrew and
remove displacement pump(21).
7 Remove four screws (183) and lock-washers (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 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
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).
311020Y
3 Clean mating surfaces of bearing and drive
housings.
4 Align connecting rod with crank (B) and carefully
align locating pins (F) in driving housing (24) with
holes in bearing housing (22). Push bearing housing
onto drive housing or tap into place with plastic
mallet.
To prevent damage to soft key buttons, do not
press the buttons with sharp objects such as pens,
plastic cards, or fingernails.
5 Install screws (183) and lock-washers (173) on
bearing housing. Torque evenly, referencing note 3
value in Fig. 2.
6 Install pump. Refer to Displacement Pump,
Installation, page 21.
2
236
83
3
173
7675B
3
183
187
84
235
21
A
1
Oil
2
Pack with bearing grease 114819
3
LineLazer IV 3900/R300: Torque to
200 in-lb (22.6 N·m) LineLazer V
5900: Torque to 25 ft-lb
Model 248862 shown
Bearing Housing and Connecting Rod
NOTICE
2
B
E
D
F
26
C
1
100
60
24
22
34g
34
ti25624a
Fig. 2
11