Hitachi GMAX II 3900 - Manual (Page 9)

Drive Housing
310893L 9
Drive Housing
Removal
1. Relieve pressure; page 5.
2. Remove bearing housing. Refer to Bearing Housing and
Connecting Rod, Removal, page 8.
3. Premium sprayers: Remove two screws (108) and gallon
counter sensor (39).
4. Remove six screws (38).
5. Lightly tap around drive housing (33) to loosen drive
housing. Pull drive housing straight off pinion housing. Be
prepared to support combination gear (32) which may
also come out.
Installation
1. F IG . 2. Apply all grease supplied with replacement gear
cluster to gear teeth and to areas called out by note 3.
2. F IG . 3. Ensure thrust washers (30, 31; 5900/7900) (30, 31,
72; 3900) are on combination gear (32) and washers (Fig.
2; 33a, 33b) are on crankshaft of drive housing (33) as
shown.
3. Clean mating surfaces of pinion and drive housings.
4. Align gears and push new drive housing straight onto
pinion housing (29) and locating pins (B).
5. Install six screws (38).
6. Install gallon counter sensor (39) with two screws (108).
7. Install bearing housing. Refer to Bearing Housing and
Connecting Rod, Installation, page 8.
8. Install screws (38) in drive housing. Torque evenly to note
3 value in F
IG . 2.
9. Install pump. Refer to Displacement Pump, Installation,
page14.
F IG . 3
WARNING
Read Injection Hazard, page 3; Burn Hazard, page 4
CAUTION
Premium models: Gallon counter sensor is connected to con-
trol board in pressure control. Pulling on the sensor wires could
cause damage.
CAUTION
Thrust washers may stick to grease inside of drive housing.
Do not lose or misplace.
CAUTION
DO NOT use drive housing screws (38) to align or seat
drive housing with pinion housing. Align these parts with
locating pins, to avoid premature bearing wear.
F IG . 2
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B
A


3
2
1
Gallon counter sensor
Pack with grease 114819
GMAX II 3900: Torque to 140 ±10 in-lb (15.8 ±1.1N.m)
GMAX II 5900: Torque to 200 ±10 in-lb (22.6 ±1.1 N.m)
GMAX II 7900: Torque to 200 ±10 in-lb (22.6 ±1.1 N.m)
1
Texspray 7900HD: Torque to 200 ±10 in-lb (22.6 ±1.1 N.m)





  
TIA
1
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Copper
Steel