Cleaning; Installation Of Drive Hub (Mechanically Governed Engines) - Mack E7 Service Manual

5-101.bk Page 65 Friday, March 17, 2006 11:05 AM

Cleaning

Degrease tapered surfaces of injection pump
camshaft and drive hub with Stoddard No. 303 or
Loctite 75559, or an equivalent degreasing agent.
Failure to degrease drive components prior to
assembly may result in drive hub slippage.
Installation of Drive Hub
(Mechanically Governed Engines)
Refer to Figure 5-77.
1. Place injection pump into pump holding
fixture J 37078. Turn pump drive hub to
allow pump to be slid forward, engaging
alignment pins until pump mounting surface
is flush with fixture bracket.
Figure 5-77 — Positioning Drive Hub and Pump in
1. Holding fixture J 37078
2. Drive hub
200 BENCH PROCEDURES
Fixture
3. Fuel injection pump
MACK E7 engines equipped with Bosch P7100
Series close-coupled injection pumps require a
longer drive pump hub.
Do not install a key in the driveshaft. A key is not
required and no keyway is provided in the hub.
Refer to Figure 5-78.
2. Install the flat washer and drive hub nut.
Torque to 200 lb-ft (271 N•m) using torque
wrench J 24407 or equivalent.
3. Remove injection pump from holding fixture.
The recess in the drive hub is now in position to
clear the camshaft gear during installation.
Figure 5-78 — Drive Hub Retaining Capscrew
Installation
Page 5-65