Bearing Housing & Connecting Rod - Graco GMAX II 3900 Repair Manual

Bearing Housing and Connecting Rod
NOTE: The item numbers referenced are for the 5900
Hi-Boy models. The 3900, 7900 and all Lo-Boy models
may have different item numbers. Use the 5900 Hi-Boy
item number and part to find the corresponding alter-
nate part and item number.
Removal
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4
1. Relieve pressure; page 5.
2. F . 1. Remove four screws (45) and front cover (44)
IG
3. Remove pump. Refer to Displacement Pump, Removal,
page 16.
4. Remove four screws (41) and washers (42) from bearing
housing (40).
5. Pull connecting rod (43) and lightly tap lower rear of
bearing housing with plastic mallet to loosen from drive
housing (33). Pull bearing housing and connecting rod
assembly off drive housing.
6. Inspect crank (B) and connecting rod (43) for excessive
wear and replace parts as needed.
Installation
1. Evenly lubricate inside of bronze bearing (C) in bearing
housing (40) with high-quality motor oil. Liberally pack top
roller bearing (E), lower bearing (D) inside connecting rod
(43) with bearing grease.
2. Assemble connecting rod (43) to bearing housing (40).
Rotate connecting rod to lowest position.
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 (33) with holes in
bearing housing (40). Push bearing housing onto drive
housing or tap into place with plastic mallet.
8
Bearing Housing and Connecting Rod
CAUTION
DO NOT use bearing housing screws (41) to align or
seat bearing housing with drive housing. Align these
parts with locating pins, to avoid premature bearing
wear.
5. Install screws (41) and washers (42) in bearing housing.
Torque evenly to note 3 value in Fig. 1.
6. Install pump. Refer to Displacement Pump, Installation,
page 14.
1
Oil
2 Pack with bearing grease 114819
GMAX II 3900: Torque to 200 in-lb (22.6 N.m)
3
GMAX II 5900: Torque to 25 ft-lb (34 N.m)
GMAX II 7900: Torque to 40 ft-lb (54 N.m)
TexSpray 7900HD: Torque to 40 ft-lb (54 Nm
F . 1
IG
310893L