Allied Construction Products, LLC www.alliedcp.com
18
TM574173_HP4000_18feb
9.0 Care & Maintenance - [cont’d]
9.8.1 Bolts – Tightening Method, Pre-tensioning
and Torque
x
Install all bolts by hand until finger tight.
x
Bolts should be systematically tightened starting
from the most rigid part of the joint. Follow a
crisscross pattern (Ref Fig. 9-5)
x
Use progressive tightening of bolts. Turn each
bolt a little at a time until final torque is reached.
Step 1. Tighten all bolts to 1/3 of the final torque in
Table 9.2.
Step 2. Repeat pattern and tighten all bolts until 2/3
of the specified torque is reached.
Step 3. Repeat pattern and tighten to final torque.
Fig. 9-5 Criss-cross Pattern for Bolted Assemblies
Fig. 9-6 Use Thread Locker On All Item 1 Bolts
IMPORTANT
For bearing housing bolts, apply a commercially
available thread locker (Example Loctite 242 or
equivalent). Follow manufacturer’s instructions for
application.
NOTE
:
After bolt installation, operate the Ho-Pac for
a few hours, and then re-check bolt torques
.
Table 9.2 Standard Tightening Torque
SAE bolts are identified by radial lines on the head.
Metric bolts identified by the class number on head.
Fig. 9-7 SAE Bolt Head Markings & Metric Class
SAE GR 8
CL 8.8
CL 10.9
Size
ft-lb
N
x
m
ft-lb
N
x
m
ft-lb
N
x
m
3/8
35
47
1/2
85
115
5/8
170
230
3/4
280
380
7/8
400
542
1
650
880
1-1/2
2000
2700
9.9 Hydraulic Motor & Flow Regulator Valve
NOTE:
There is no maintenance service for the
hydraulic motor and flow valve. Contact Allied’s
Technical Service if further information is required.
