Mammoth 850 Critical Torque Chart
Engine Crankshaft - PTO Clutch
7/16 - 20 x 2" GR8
70 ft-lbs
-10/+15%
Engine Mounting Bolts
3/8 - 16 x 1.25" GR5
24-26 ft-lbs
see range
Start by hand for first 3-4 threads
Pump Pulley Bolt
5/16 - 24 x 1.25" GR5
18 ft-lbs
-10/+15%
Pump Mounting Bolts
1/2 - 13 x 1.50" GR5
70 ft-lbs
-10/+15%
Wheel Mounting Nuts
1/2 - 13
75 ft-lbs
-10/+15%
Wheel Motor Bolts
1/2 - 13 x 2.50" GR8
65 ft-lbs
-10/+15%
ORFS Fittings @ Pump (Hose End)
-8 ORFS 13/16 - 16
40 ft-lbs
+10%/0
Parker Spec
ORFS Fittings @ Wheel Motors (Hose End)
-8 ORFS 13/16 - 16
40 ft-lbs
+10%/0
Parker Spec
Straight Thread Port - Adaptor Fittings (Wheel Motor)
7/8 - 14
100 ft-lbs
+10%/0
Parker Spec
Straight Thread Port - Adaptor Fittings (Pump)
3/4 - 16
60 ft-lbs
+10%/0
Parker Spec
Straight Thread Port - Swivel Elbow (5/16" Hose Barb-Pump)
7/16 - 20
180 in-lbs
+10%/0
Parker Spec
Muffler Mounting Nuts
M8 x 1.25
17 ft-lbs
-10%/+15%
Muffler Bracket Bolts
M8 x 1.25 x 25
17 ft-lbs
-10%/+15%
Gearbox Brackets
1/2 - 13 x 1.25
52 ft-lbs
-10%/+15%
75% of GR5 Value
Set Screws - PTO Shaft Coupling
3/8 - 16
317 in-lbs
-10%/+15%
Set Screws - PTO Shaft Flange Bearing
1/4 - 28
65-85 in-lbs
see range
Course Thread
This chart is for zinc plated non lubricated and non locking fasteners only.
| Release Date |
6/7/16 |
Grade 2 |
Grade 5 |
Grade 8 |
| Size |
Thread per inch |
Tightening Torque (ft-lbs) k=.2 |
Low end of Torque Tolerance |
High end of Torque Tolerance |
Tightening Torque (ft-lbs) k=.2 |
Low end of Torque Tolerance |
High end of Torque Tolerance |
Tightening Torque (ft-lbs) k=.2 |
Low end of Torque Tolerance |
High end of Torque Tolerance |
| 1/4 |
20 |
5.1 |
4.4 |
6.2 |
7.9 |
6.8 |
9.6 |
11.1 |
9.5 |
13.5 |
| 5/16 |
18 |
10.5 |
9.0 |
12.8 |
16.2 |
13.9 |
19.7 |
22.9 |
19.7 |
27.8 |
| 3/8 |
16 |
18.6 |
16.0 |
22.6 |
28.8 |
24.7 |
35.0 |
40.7 |
34.9 |
49.4 |
| 7/16 |
14 |
29.8 |
25.6 |
36.2 |
46.1 |
39.5 |
56.0 |
65.1 |
55.8 |
79.1 |
| 1/2 |
13 |
45.5 |
39.0 |
55.3 |
70.4 |
60.3 |
85.4 |
99.3 |
85.1 |
120.6 |
| 9/16 |
12 |
65.7 |
56.3 |
79.8 |
101.5 |
87.0 |
123.3 |
143.3 |
122.9 |
174.0 |
| 5/8 |
11 |
90.6 |
77.7 |
110.1 |
140.1 |
120.1 |
170.1 |
197.8 |
169.5 |
240.1 |
| 3/4 |
10 |
160.7 |
137.8 |
195.2 |
248.4 |
212.9 |
319.4 |
350.7 |
300.6 |
450.9 |
| 7/8 |
9 |
155.6 |
133.4 |
189.0 |
400.9 |
343.6 |
515.4 |
566.0 |
485.1 |
727.7 |
| 1 |
8 |
233.3 |
200.0 |
283.3 |
601.0 |
515.1 |
772.7 |
848.4 |
727.2 |
1090.8 |
Fine Thread
This chart is for zinc plated non lubricated and non locking fasteners only.
| Release Date |
6/7/16 |
Grade 2 |
Grade 5 |
Grade 8 |
| Size |
Thread per inch |
Tightening Torque (ft-lbs) k=.2 |
Low end of Torque Tolerance |
High end of Torque Tolerance |
Tightening Torque (ft-lbs) k=.2 |
Low end of Torque Tolerance |
High end of Torque Tolerance |
Tightening Torque (ft-lbs) k=.2 |
Low end of Torque Tolerance |
High end of Torque Tolerance |
| 1/4 |
28 |
5.8 |
5.0 |
7.1 |
9.0 |
7.7 |
11.0 |
12.7 |
10.9 |
15.5 |
| 5/16 |
24 |
11.6 |
10.0 |
14.1 |
18.0 |
15.4 |
21.8 |
25.4 |
21.8 |
30.8 |
| 3/8 |
24 |
21.1 |
18.1 |
25.7 |
32.7 |
28.0 |
39.6 |
46.1 |
39.5 |
56.0 |
| 7/16 |
20 |
33.3 |
28.6 |
40.5 |
51.5 |
44.1 |
62.5 |
72.7 |
62.3 |
88.3 |
| 1/2 |
20 |
51.3 |
44.0 |
62.3 |
79.3 |
68.0 |
96.3 |
111.9 |
95.9 |
135.9 |
| 9/16 |
18 |
73.3 |
62.8 |
89.0 |
113.2 |
97.1 |
137.5 |
159.9 |
137.0 |
194.1 |
| 5/8 |
18 |
102.7 |
88.0 |
124.7 |
158.7 |
136.0 |
192.7 |
224.0 |
192.0 |
272.0 |
| 3/4 |
16 |
179.5 |
153.9 |
218.0 |
277.4 |
237.8 |
356.7 |
391.7 |
335.7 |
503.6 |
| 7/8 |
14 |
171.5 |
147.0 |
208.2 |
441.7 |
378.6 |
567.9 |
623.5 |
534.5 |
801.7 |
| 1 |
14 |
255.3 |
218.8 |
310.0 |
657.5 |
563.6 |
845.3 |
928.2 |
795.6 |
1193.4 |
Parker HP2 Pump Tool and Torque List
Housing Bolts (8)
- 282 - 342 lb-in (23.5 - 28.5 lb-ft), 31.9 - 38.6 Nm
- Tools Needed: 13mm Socket Wrench
Drain Plug
- 360 - 480 lb-in (30 - 40 lb-ft), 40.7 - 54.2 Nm
- Tools Needed: 5/16" Allen Wrench or Allen Socket
Check Valve Plug / Shock Valve Cap (4)
- 252 - 288 lb-in (21 - 24 lb-ft), 28.4 - 32.5 Nm
- Tools Needed: 5/8" Socket Wrench
Bypass Valve (2)
- 80 - 100 lb-in (6.7 - 8.3 lb-ft), 9 - 11.3 Nm
- Tools Needed: 5/8" Socket Wrench
Filter
- 110 - 140 lb-in (9.2 - 11.7 lb-ft), 12.4 - 15.8 Nm
- Tools Needed: 5/8" Socket Wrench
Fan Nut
- 90 - 110 lb-in (7.5 - 9 lb-ft), 10-2 - 12.4 Nm
- Tools Needed: 9/16" Socket Wrench
Expansion Tank Adapter Assembly
- 100 - 120 lb-in (8.3 - 10 lb-ft), 11.3 - 13.6 Nm
- Tools Needed: 41mm Combination Wrench or Crows Foot Socket
Charge Pump Cover Bolts (2)
- 155 - 190 lb-in (12.9 - 15.8 lb-ft), 17.5 - 21.5 Nm
- Tools Needed: 13mm Socket Wrench
RTN Housing Bolt (5/16" - 24 Socket Head Cap Screw) (2)
- 264 - 288 lb-in (22 - 24 lb ft), 29.8 - 32.5 Nm
- Tool Needed: 1/4" Allen Wrench or Allen Socket
Other Tools Needed:
- Snap Ring Pliers (Input Shaft Snap Ring)
- Dead Blow Hammer or Rubber Mallet
- Craftsman 42973 Cold Chisel or Equivalent
- 9/16" Combination Wrench (For Holding/Turning Input Shaft and Removing Fan Spacer
- Fixture For Holding Tandem Pump Vertically (SAE-B Flange)
- Small Flat Blade Screwdriver (For Removing Trunnion Arm Seal Retaining Ring)
- Hook Type Spring Removal Tool